Blood Mage Frostbolt Comet Endgame Build

Introduction

This guide has been fully updated for The Third Edict League (Patch 0.3.0).

The Frostbolt Comet Blood Mage Witch utilizes an arsenal of Cold Spells to optimize gameplay for speed-farming maps and killing pinnacle bosses. To clear maps, Ice Nova freezes enemies to trigger a barrage of Frostbolt projectiles from Elemental Invocation. Against bosses, Frost Wall rapidly triggers Comet from Cast on Critical to rain down for devastating damage.

This build guide assumes you have reached endgame maps around Level 65. If you have not yet completed the campaign, follow the Frostbolt Cold Snap Leveling Build Guide. For a starter version of this build that does not require Snakepit, use the Ice Nova Comet Endgame Build Guide.

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Strengths and Weaknesses

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Build Mechanics

Infinite “Mana”

Mana is a primary concern for the typical spellcaster. The Mana costs of Skills continue to grow as you increase skill gem levels, and most support gems multiply costs even further. To achieve enough Mana sustain for these high costs, a considerable investment must be made to gain Maximum Mana and Mana Regen using Skill Points and gear affixes.

The Blood Mage Ascendance node, Vitality Siphon, enables Spell damage to be leeched as Life to provide an endless source of Life sustain. This enables the Blood Mage to utilize Blood Magic, removing mana entirely to only pay skill costs with Life.

Life leech by default occurs over 1 second, but Atziri’s Acuity grants instant leech from Critical Hits. This effect is crucial for keeping your Life pool full, especially during boss fights. Without these gloves, your Life pool may not recover fast enough to keep up with the rate of triggered spells, causing you to lose casts.

Life is also recovered by Life Remnants, granted by Sanguimancy. These life globes spawn primarily from killing enemies and can overflow Maximum Life to 1.5 times the normal amount. Continue to absorb Life Remnants while clearing groups of enemies to become nearly invincible.

Snakepit

The unique ring, Snakepit, is highly recommended as your first expensive purchase. Equip Snakepit in the left ring slot to remove the piercing effect from Frostbolt and cause the projectiles to fork. An additional 8 projectiles are fired around you when Sione’s Temper procs for amazing screen-wide clearing. Each of the projectiles fired split into 2-3 projectiles after hitting the first enemy and then explode on the second enemy. Against groups of enemies, Frostbolt explosions can shotgun targets to hit them multiple times.

Boss Fights

In boss fights, Comet is rapidly triggered from Cast on Critical through multiple explosions from Frost Wall supported by Pinpoint Critical to reach 100% Critical Hit Chance.

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Skill Rotation

Follow the basic skill rotation below to progress through the campaign and clear groups of enemies in maps:

1. Cast Ice Nova to freeze enemies and build Energy for Elemental Invocation. Ideally, you want to deal enough damage to freeze enemies in one cast, as spamming Ice Nova can rapidly deplete your Life pool. Ice Nova needs to freeze enemies before Frostbolt to generate energy.
2. Cast Elemental Invocation to release Frostbolt. Aim in the direction you want the most Frostbolts to travel to. Sione’s Temper fires additional projectiles around you for efficient screen-wide coverage.
3. If additional damage is needed against tough elites, cast Frost Wall on top of them for additional explosions.
4. Cast Cold Snap to finish off any surviving enemies that are frozen.

Execute the steps below to optimize damage against bosses:

1. Before starting a pinnacle boss fight, fully charge Spellslinger by spamming Orb of Storms. Allow Orb of Storms to expire to collect Lightning Infusions for Frost Wall.
2. Approach the boss to cast Sigil of Power from a Chiming Staff equipped in Weapon Set 2 to buff damage.
3. Switch back to Weapon Set 1 (can be set to automatically swap) before casting Elemental Weakness to reduce the Resistance of the boss. Elemental Weakness can be pre-cast before a boss spawns if supported by Cursed Ground.
4. Cast Frost Bomb to apply Elemental Exposure.
5. Cast Frost Wall on top of the boss.
6. If you have charges for Elemental Invocation against map bosses, release all triggers of Frostbolt to hit Frost Wall for shotgun explosions.
7. Cast Spellslinger to release multiple triggers of Comet.
8. Once Comet starts to land, repeat casts of Frost Wall to continue the chain reaction.

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Video Guide

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Skill Gems, Spirit Gems, and Support Gems

The Frostbolt Comet Blood Mage utilizes the following Skill Gems, Spirit Gems, and Support Gems. Gem Sockets are listed in order of priority.

The Spirit Gem setup requires 137 total Spirit to activate Cast on Critical and Blink. Ensure you apply 20% quality to the Cast on Critical skill gem and allocate Efficient Inscriptions in the passive tree to reduce the Spirit reservation. Defeat The King in the Mists (Act 1), Ignagduk (Act 3), and Lythara (Interlude) to gain 100 base Spirit. Obtain the remaining 37 Spirit from your Amulet.

While clearing maps, activate Elemental Invocation to trigger Frostbolt. Craft a lower-level Elemental Invocation gem to reduce its Dexterity requirement (Level 13 recommended).

Against bosses, deactivate Elemental Invocation to instead activate Cast on Critical to trigger Comet.

Equip a Chiming Staff in Weapon Set 2 to unlock Sigil of Power, which provides a damage buff against bosses. Ensure you set all your other skills to only be used with Weapon Set 1, so you automatically swap back.

Orb of Storms can be crafted at Level 3 to reduce its Life cost.

Prioritize obtaining Atalui’s Bloodletting and Embitter to combo together for a massive damage increase. Only 1 Atalui’s Bloodletting can be equipped in the skill setup, so you need to switch the support gem between the 2 meta gems. If you do not yet have Atalui’s Bloodletting, socket Boundless Energy II instead, and replace Embitter with Energy Retention.

Perfect Jeweller’s Orb priority on Skill Gems: Elemental Invocation > Ice Nova > Cast on Critical > Frost Wall > Snap > Frost Bomb.

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Ascendancy

Blood Mage is the recommended Ascendancy for the Frostbolt Comet Witch. The chosen Ascendancy can be switched within the base class by repeating your highest trial completion.

Allocate the Ascendancy nodes for Blood Mage in the following order:

1. Sanguimancy and Vitality Siphon — These nodes need to be allocated together to be able to sustain the Life costs of Skills with Spell Leech.
2. Sunder the Flesh — Sets the base Critical Hit Chance of Spells to 15%.
3. Grasping Wounds — The delayed damage taken drastically improves survivability against getting one-shot by allowing you time to recover Life.
4. Crimson Power — Energy Shield granted by your Body Armor also provides Maximum Life, which can amount to 1000+. The Maximum Life also scales damage output when Rathpith Globe is equipped.

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Passive Skill Tree

In the Passive Skill Tree, utilize attribute nodes to fulfill any Intelligence and Dexterity requirements, and then allocate the remaining points to Strength for Maximum Life.

The following Passive Tree setup focuses on scaling damage and obtaining benefits for invocation/triggered skills. This setup is optimized with the assumption that you equip Rathpith Globe for a massive amount of Critical Hit Chance and Increased Spell Damage, which diminishes the value of nodes with those stats. Nodes enhancing Energy Shield recharge rate and start delay are necessary for survivability when spending Life to cast spells.

The Passive Tree below is the final setup after you obtain an Undying Hate Timeless Jewel with Tribute to Tecrod (souls number value does not matter). Insert the jewel into the socket next to Elemental Equilibrium to convert the keystone to Sacrifice of Blood. The Life spent on casting skills is regenerated over 8 seconds, and Zealot’s Oath allows the life regeneration to recover Energy Shield. This setup has the most survivability, without needing any Energy Shield Recharge nodes.

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Gear

The preferred gear for the Frostbolt Comet Blood Mage is listed below with affixes ranked in order of importance. Prioritize Rare Items with the correct base stats and beneficial explicit affixes. Recommended Unique Items are listed below the Rare Item table.

Rare Items

Equipment Slot and Base Stats	Affix Priority	Notes
Wand — Dueling	1. Level of all Cold Spell Skills 2. All Extra Damage types with a priority on Cold 3. Critical Spell Damage Bonus and Critical Hit Chance for Spells 4. Spell Damage 5. Cold Damage	Sockets: 1. (Expensive) Hedgewitch Assandra’s Rune of Wisdom for +1 to Level of all Spell Skills 2. (Cheap) Greater Glacial Rune for 10% Extra Cold Damage
Focus (replaced by Rathpith Globe)	1. Level of all Spell Skills 2. Critical Spell Damage Bonus and Critical Hit Chance for Spells 3. Spell Damage 4. Cold Damage 5. Maximum or Increased Energy Shield	Sockets: 1. Any Rune that grants Resistance if not yet capped. 2. Owl Talisman for 10% Increased Cooldown Recovery Rate
Helmet — Energy Shield	1. Resistances 1. Maximum Life 2. Maximum or Increased Energy Shield 3. Critical Hit Chance	Sockets: 1. Any Rune that grants Resistance if not yet capped. 2. Talisman of Eeshta for 10% Increased Cost Efficiency
Body Armor — Energy Shield	1. Maximum and Increased Energy Shield (prioritize the highest total Energy Shield) 2. Resistances 2. Maximum Life	Sockets: Greater Iron Rune
Gloves — Energy Shield (replaced by Atziri’s Acuity)	1. Resistances 1. Maximum Life 2. Critical Damage Bonus 2. Maximum or Increased Energy Shield	Sockets: 1. Any Rune that grants Resistance if not yet capped. 2. Fenumus’ Rune of Spinning for 8% Increased Cast Speed
Boots — Energy Shield	1. Movement Speed 1. Resistances 1. Maximum Life 2. Maximum or Increased Energy Shield	Sockets: 1. Any Rune that grants Resistance if not yet capped. 2. (Expensive) Farrul’s Rune of the Chase for 5% Increased Movement Speed 3. (Cheap) Farrul’s Rune of Grace for 6% Reduced Movement Speed Penalty from using Skills
Amulet	1. Spirit (37) 2. Level of all Spell Skills 3. Maximum or Percent Increased Life 4. Maximum Energy Shield 4. Resistances	Anointment: Split Shot Quality: Flesh Catalyst
Left Ring Slot — Snakepit	1. Cast Speed 2. Spell Damage	Quality: Sibilant Catalyst
Right Ring Slot	1. Resistances 1. Maximum Life 2. Cold Damage 3. Rarity of Items Found	Quality: Flesh Catalyst
Belt — Heavy	1. Maximum Life 2. Resistances 3. Flask Life Recovery Rate 4. Charm Effect Duration 4. Stun Threshold	–

Unique Items

The following required and recommended Unique Items for the Frostbolt Comet Blood Mage are listed below:

• Snakepit (required) enables Frostbolt to fork and then explode when equipped in the left ring slot.
• Rathpith Globe (recommended) provides a massive damage boost that scales by stacking Maximum Life.
• Atziri’s Acuity (recommended) is helpful to instantly leech Life from Critical Hits to sustain rapidly triggering Spells, especially during pinnacle boss fights. Without the instant leech, Life can become completely drained, causing you to lose triggers. An Atziri’s Acuity with an extra socket from corruption is beneficial for 2x Fenumus’ Rune of Spinning.

Jewels

The beneficial affixes for Jewels are listed below, ranked in order of importance. Prioritize Rare Jewels with two prefixes and two suffixes.

• Prefixes
  1. Increased Energy Shield
  2. Energy Shield Recharge Rate or Faster Start (if not yet using Zealot’s Oath)
  3. Area of Effect
  4. Cold Penetration
  5. Triggered Spell Damage, Spell Damage, Elemental Damage, or Cold Damage
• Suffixes
  1. Critical Damage Bonus or Critical Spell Damage Bonus
  2. Critical Strike Chance or Critical Strike Chance for Spells
  3. Cast Speed

In addition to the Rare Jewels, a Prism of Belief Unique Diamond with 1-3 Levels of Frostbolt (for clearing maps) or Comet (for killing bosses) is a priority to increase damage output.

Campaign Buffs

Quest rewards during the campaign offer a selection of buffs to your character. Choose the following buffs for the build:

• Valley of the Titans Altar: 30% increased Charm Charges gained
• Venom Draught: 30% increased Elemental Ailment Threshold
• Trial of Ngkanu: Resistances
• Goddess of Justice: 20% increased Life Recovery from Flasks

For more details, check the guide on Campaign Difficulties and Permanent Stat Bonuses.

Flasks and Charms

Prioritize the following Flasks and Charms:

• Health Flask
  • Prefix: Increased Life Recovered, Remove Life Recovered from Mana when used
  • Suffix: Increased Charges
• Mana Flask
  • Prefix: any
  • Suffix: Increased Charges
• Charm:
  1. Thawing Charm: Increased Duration
  2. Stone Charm: Increased Duration
  3. Silver Charm: Increased Duration (The Fall of the Axe Unique Silver Charm preferred)

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Changelog

• September 6th, 2025:
  • Build reworked for Elemental Invocation.
  • Gameplay video added.
• August 27th, 2025: Guide updated for the Third Edict League (Patch 0.3.0).
• May 24th, 2025: Guide created for Path of Exile II, Early Access.