Cast on Crit Blast Rain Ascendant Build Guide (PoE Blight 3.8)

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Introduction

The Cast on Crit Blast Rain Ascendant is a type of character that is built around the Cast On Critical Strike Support Cast On Critical Strike Support gem. The main idea of the build is to Critically strike with an attack as often as possible in order to cast a big quantity of spells in short period of time. In this particular build guide we choose to play around Arc Arc, simply because it has good base damage and does well in both clearing and single target. This spell has also proven to be good for this type of build overtime.

We have to scale both Bow’s Critical Chance and the Spell’s Critical Chance in order to be efficient, which is why many ascendancy classes fall off, with the combination of Elementalist and Pathfinder (via the Ascendant), we manage to achieve good balance between offense, defense, and utility.

Build Summary

The build requires some currency investment, therefore it is not a good league-starter and is not recommended for newer players. The most expensive part would be the Shaper-based Bow, which can roll the specific mod we are looking for, “Socketed Gems are supported by Level # Cast On Critical Strike”; this will essentially allow us to run our Blast Rain Blast Rain on a 7-Link, which will then be able to trigger multiple Arc Arcs with a single attack. Having our main link in the Bow means we free up a lot of sockets, which allows us to use Kaom's Heart Kaom's Heart. For the other gear we are looking for well rolled rares with Life and resistances.

Pros & Cons

Pros

+ Hardcore viable
+ Solid balance between clear speed and single target
+ Different from most builds, fun to play

Cons

- Requires initial investment, can get very expensive if you aim for best-in-slot items

Playstyle

Offensively, having good uptime on your Diamond Flask Diamond Flask will ensure you Crit all the time, therefore you will cast as many Arc Arcs as the Cast On Critical Strike Support Cast On Critical Strike Support cooldown allows you to. The build uses Elemental Equilibrium, which will allow you to lower enemies’ Lightning resistance every time you hit it with Blast Rain Blast Rain, this is why it is important to not have any Lightning damage added to attacks.

Defensively, you should keep your distance and have in mind that you are playing an Evasion/Dodge-based Bow character. The build achieves great Life pool along with a lot of increased Flask Effect, which will improve the defense your utility flasks will provide.

For playstyle, dropping one or two Blast Rain Blast Rains will be enough to clear multiple monster packs. When you take damage, escape the dangerous situation with Blink Arrow Blink Arrow, which will give you the time needed to recover.

Ascendancy, Passive Tree , Bandits, and Pantheons

Ascendancy (Scion – Ascendant)

  1. Passive point
  2. Pathfinder
  3. Path of the Ranger (allows you to start from the Ranger starting point on the passive tree)
  4. Elementalist

Pathfinder, in combination with all the flask nodes we pick on the tree will result in very strong and durable flask effects.

Path of the Ranger allows is needed in order to pick up important nodes on the passive tree without spending unnecessary points for traveling so far.

The Elementalist ascendancy makes us immune to Elemental Reflect, provides 10% additional Elemental Penetration and some other perks with synergize very well with the build.

Passive Tree

This is the endgame passive skill tree. The main key notables the build uses are Acrobatics, Phase Acrobatics, and Elemental Equilibrium. Besides that, we focus on picking up a lot of Life, along with all the efficient Critical nodes we will need for the build to work properly.

Bandits

For this specific build we should help Alira in Act II. The Critical Multiplier and 15% all elemental resistances are stronger than the 2 passive skill points.

Pantheons

Major: Soul of the Brine King helps you avoid getting chain-stunned. Others can be used based on personal preference.

Minor: Soul of Shakari makes you immune to poison damage if you upgrade it. Soul of Ralakesh is always a viable choice when it comes to doing labyrinth runs.

Pantheon powers can be upgraded by using Divine Vessel in the Map Device while you are activating the particular Map that contains the boss you need. Once you’ve killed the boss and captured his soul, you need to deliver the vessel to Sin in Oriath.

Gems

Blast Rain Blast Rain is our signature skill, which should ideally be used in a 6-Link. For mobility, use Blink Arrow Blink Arrow and Dash Dash. When it comes to reserving your Mana, you can choose between many options, we recommend going with Grace Grace and Arctic Armour Arctic Armour.

For all the gem links we provide below, keep in mind that we list the gems in order of priority, meaning that if you lack the required number of sockets to fit all the gems, the first ones to drop are the ones at the bottom. Also note that in-game, as long as the sockets are linked, it makes no difference at all what order the gems are placed in.

Blast Rain (6-Link)

Blast Rain Blast Rain fires multiple projectiles that have in-built conversion from Physical to Fire. This means this Bow skill is simply perfect for our purpose, simply because with a single attack it will hit multiple times and proc Elemental Equilibrium. We will provide one 6-Link that works well for both single target and clearing.

  1. Blast Rain Blast Rain
  2. Cast On Critical Strike Support Cast On Critical Strike Support
  3. Arc Arc
  4. Increased Critical Strikes Support Increased Critical Strikes Support
  5. Controlled Destruction Support Controlled Destruction Support
  6. Increased Critical Damage Support Increased Critical Damage Support

Note: If you have a properly rolled Shaper Bow, this essentially allows you to drop Cast On Critical Strike Support Cast On Critical Strike Support for an additional support, we recommend Lightning Penetration Support Lightning Penetration Support, but depending on the situation and your personal preference you can use any other support gem that you like.

Other Gems

For Mana reservation buffs, we recommend Grace Grace and Arctic Armour Arctic Armour. A Decoy Totem Decoy Totem can be used in order to distract enemies while you damage them. Steelskin Steelskin can be used for additional damage mitigation. Blink Arrow Blink Arrow and Dash Dash will allow you to dodge lethal game mechanics and escape dangerous situations. The Elementalist ascendancy allows you to have 2 Golems active at a time, and we recommend Summon Stone Golem Summon Stone Golem and Summon Flame Golem Summon Flame Golem.

Gearing

Capping your elemental resistances is essential and it should always be your top priority in any build; it should be the first thing you do when gearing up a character. Obtaining a 6-link, while very powerful and certainly recommended, can potentially be very expensive (requiring an average of 1500 Orbs of Fusing, obviously depending on your luck); as such, this should not really be a goal for you while gearing up, and you should instead settle for a 5-link until you have enough resources.

Helmet

A well rolled rare helmet is best in slot. Starkonja's Head Starkonja's Head is also a good choice early on. There is no particularly powerful labyrinth enchant we are looking for, and you can use any of the Arc Arc enchants or look for “Blast Rain has a 75% chance for an additional blast”. The Rare affix priority is:

  1. +#% to Elemental Resistances (until capped)
  2. +# to Maximum Life (at least 80)
  3. % increased Maximum Life (Pristine Fossil Pristine Fossil)
  4. Nearby Enemies have -9% to Lightning Resistance (Metallic Fossil Metallic Fossil)

Body Armour

Kaom's Heart Kaom's Heart is best in slot for the build. Prior to it you can use any Body Armour with Life and resistances. The Rare affix priority is:

  1. +#% to Elemental Resistances (until capped)
  2. +# to Maximum Life (at least 80)
  3. % increased Maximum Life (Elder Prefix; Pristine Fossil Pristine Fossil)

Gloves

Rare Gloves are the best choice, simply look for as much Life as possible along with some resistances and required attributes. The Rare affix priority is:

  1. +#% to Elemental Resistances (until capped)
  2. +# to Maximum Life (at least 80)
  3. % increased Maximum Life (Pristine Fossil Pristine Fossil)
  4. % increased Attack Speed

Boots

Well-rolled rare Boots are best in slot. Atziri's Step Atziri's Step can also be used. The Rare affix priority is:

  1. +#% to Elemental Resistances (until capped)
  2. % increased Movement Speed (at least 20-25%)
  3. +# to Maximum Life (at least 80)
  4. % increased Maximum Life (Pristine Fossil Pristine Fossil)

Belt

Leather Belt Leather Belt and Stygian Vise Stygian Vise are good bases for the build. The Rare affix priority is:

  1. +#% to Elemental Resistances (until capped)
  2. +# to Maximum Life (at least 80)
  3. % increased Elemental Damage (Prismatic Fossil Prismatic Fossil)
  4. # to Strength

Amulet

We are looking for a rare Amulet. The Rare affix priority is:

  1. +#% to Elemental Resistances (until capped)
  2. +# to Maximum Life (at least 50)
  3. % to Global Critical Strike Multiplier (at least 20%)
  4. % increased Critical Strike Chance

Rings

It is strongly recommended to have a Shaper-based ring with Assassin's Mark Assassin's Mark on hit. The Rare affix priority is:

  1. +#% to Elemental Resistances (until capped)
  2. +# to Maximum Life (at least 50)
  3. Curse Enemies with Level # Assassin’s Mark on Hit (Shaper Suffix)
  4. # to Dexterity
  5. # to Strength

Weapon

The main goal of the build is acquiring decent Shaper-based Bow that will essentially allows us to have a 7-Link. We are looking for “Socketed Gems are supported by Level # Cast On Critical Strike” along with decent rolls of Attack Speed and Critical Chance on a base with good Attack Speed, like the Thicket Bow Thicket Bow. The Rare affix priority is:

  1. Socketed Gems are supported by Level # Cast On Critical Strike
  2. % increased Attack Speed
  3. % increased Critical Strike Chance

Quiver

We are looking for a rare Quiver with Life and resistances, ideally it would also have Critical modifiers. The Rare affix priority is:

  1. +#% to Elemental Resistances (until capped)
  2. +# to Maximum Life
  3. % increased Global Critical Strike Chance
  4. % to Global Critical Strike Multiplier

Flasks

Diamond Flask Diamond Flask is mandatory in every Critical-based build, this is a good flask to have Curse or Freeze immunity on. Atziri's Promise Atziri's Promise brings survivability with the 35% Chaos Resistance along with a lot of damage. Vessel of Vinktar Vessel of Vinktar will allow you to Penetrate even more Lightning resistance along with providing you a very reliable source of Life leech; The Wise Oak The Wise Oak can also help you improve your Lightning Penetration as long as your Lightning resistance is the highest. Divine Life Flask Divine Life Flask is where we should roll Bleed Immunity and Instant Recovery. Quicksilver Flask Quicksilver Flask will improve your mobility even further. Basalt Flask Basalt Flask, Jade Flask Jade Flask, Stibnite Flask Stibnite Flask and Quartz Flask Quartz Flask are all great utility flasks that the build can make great use of. Make sure you have Bleed, Freeze and Curse immunity rolled on your flasks.

Be sure to check out our Flask Crafting Guide to learn everything you need to know about how to set up your non-Unique flasks.

Jewels

There are no mandatory Jewels for the build. Watcher's Eye Watcher's Eye with Grace Grace mods would be ideal, or any other Aura mods depending on the Aura you chose. It is recommended to have at least one Abyssal Jewel with Onslaught on Kill.

Regular Jewel Affix Priority

  1. % increased Maximum Life
  2. % increased Damage
  3. % increased Critical Multiplier

Abyssal Jewel Affix Priority

  1. +# to maximum Life
  2. % chance to gain Onslaught for # seconds on Kill

Leveling

As a reminder, we have several guides to help you level up a character.

The character should be leveled as an elemental-stacking Bow build since this will be the easiest way to reach maps and gear yourself for some Cast On Critical Strike Support Cast On Critical Strike Support action.

Leveling Passive Trees

With this passive tree you will easily be able to start using the character as intended, you will have enough Life, all the important Critical and Flask nodes along with the three major keystone notables the build uses: Acrobatics, Phase Acrobatics and Elemental Equilibrium.

Useful leveling uniques

As you begin a new character there are few unique items that can boost your power exponentially. Tabula Rasa Tabula Rasa allows you to have a 6-Linked skill as early as you get the gems. Wanderlust Wanderlust gives a decent movement speed, which will make your leveling that much more efficient. Goldrim Goldrim provides a lot of elemental resistances, this will let you worry less about gearing when approaching certain Act encounters.

Gem Progression

Using Tabula Rasa Tabula Rasa will allow you to have 6-Link gem setups early on, which is why we show such examples below. If you cannot get Tabula Rasa (or another item with a 6-Link), then simply prioritize the first gems in each link provided below.

In order to acquire gems that are not available to your class as a quest reward, simply ask a friend to buy them off vendors for you, or buy them yourself from Sioasa in The Library in Act III Library.

From level 1, you should use the following link.

  1. Ice Shot Ice Shot
  2. Pierce Support Pierce Support
  3. Onslaught Support Onslaught Support

At level 4, you should pick Decoy Totem Decoy Totem, Dash Dash and Steelskin Steelskin.

By level 8, your Ice Shot Ice Shot should look like this.

  1. Ice Shot Ice Shot
  2. Lesser Multiple Projectiles Support Lesser Multiple Projectiles Support
  3. Pierce Support Pierce Support
  4. Onslaught Support Onslaught Support
  5. Added Cold Damage Support Added Cold Damage Support
  6. Added Lightning Damage Support Added Lightning Damage Support

At level 10, you should get Blink Arrow Blink Arrow for additional mobility, along with Precision Precision.

At level 12, you should drop your Ice Shot Ice Shot for the following Vaal Rain of Arrows Vaal Rain of Arrows gem setup.

  1. Vaal Rain of Arrows Vaal Rain of Arrows
  2. Onslaught Support Onslaught Support
  3. Added Cold Damage Support Added Cold Damage Support
  4. Added Lightning Damage Support Added Lightning Damage Support

At level 16, you should pick Herald of Ice Herald of Ice and Herald of Thunder Herald of Thunder.

By level 18, your Vaal Rain of Arrows Vaal Rain of Arrows gem link should look like this.

  1. Vaal Rain of Arrows Vaal Rain of Arrows
  2. Onslaught Support Onslaught Support
  3. Elemental Damage with Attacks Support Elemental Damage with Attacks Support
  4. Elemental Focus Support Elemental Focus Support
  5. Added Cold Damage Support Added Cold Damage Support
  6. Added Lightning Damage Support Added Lightning Damage Support

FAQ

What map mods should be avoided?

No Regeneration maps should be avoided at all costs. The build is immune to Elemental Reflect via the Elementalist ascendancy.

Conclusion

The Cast on Crit Blast Rain Ascendant is a Bow character that has very interesting build concept. It uses the Cast On Critical Strike Support Cast On Critical Strike Support in combination with very frequent attacks in order to trigger multiple Spell casts in a second. The build is expensive and requires currency investment, therefore it is not good early in the league.

Changelog
  •   

    Revisited and updated for Blight 3.8. The build remains unchanged and is as solid as before.

  •   

    Build added.

  1. Posts
    3

    Thanks a lot for all these guides!

    I have a question though. I am a big fan of Cast on Crit but when i look at it i wonder: Where is the advantage of this build over making a build that just uses Arc?

  2. Vvckd

    Moderator

    Posts
    464

    On 08/09/2019 at 5:11 PM, Marloss said

    Thanks a lot for all these guides!

    I have a question though. I am a big fan of Cast on Crit but when i look at it i wonder: Where is the advantage of this build over making a build that just uses Arc?

    Hey, even though they might seem similar, the playstyles of CoC Arc and self-cast Arc is very different. With Cast on Crit builds you are mainly bypassing a Mana problem you would have otherwise. Most of the time CoC builds are more efficient but at the cost of heavier currency investment.

  3. Posts
    3

    On 08/09/2019 at 5:26 PM, Vvckd said

    Hey, even though they might seem similar, the playstyles of CoC Arc and self-cast Arc is very different. With Cast on Crit builds you are mainly bypassing a Mana problem you would have otherwise. Most of the time CoC builds are more efficient but at the cost of heavier currency investment.

    Hey, ok i understand. But i meant more like strength wise. Is it comparable? Or isnt it much easier to get more damage if you just concentrate on Spell power for example?

    I just ask because i really love cast on crit but i dont know if it is worth the effort in the end. I dont mind the difficult way if it works out.

    Kind regards

    Marloss

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