Boss Impaler - Spectral Throw Champion Passive Skill Tree & Gem Links
Passive Skill Tree
You can find an optimized Path of Building here. Every build I release will use the community fork of Path of Building, which is maintained and updated in a much more regular fashion than the original one. You can find PoB’s Fork, by LocalIdentity, here.
If you are not comfortable with Path of Building, we also have a PoePlanner for you. Do note that PoE Planner does not support Cluster Jewels and some specific unique jewels and it is highly recommended you install Path of Building to follow builds most optimally.
Progression Advice
I’m counting on the fact that you’re using a lot of twink gear or a Hollow Palm setup for leveling, but I’ll leave you with this Path of Building to give you an idea as to what I would suggest your tree looks like at the beginning of maps.
If you’re not comfortable with Path of Building, here’s a PoePlanner to give you an idea of how your tree should look like whenever you’re at about that level.
Gem Links
 Spectral Throw – Main Link (6-Link)
 Spectral Throw – Main Link (6-Link)
Your 6th link is a little bit up for debate here. Damage on Full Life outperforms Maim Support by quite a bit but also is conditional to you staying on Full Life and dodging mechanics. Play around with both and see which one feels better for you individually. Make sure to swap out  Greater Multiple Projectiles Support for
 Greater Multiple Projectiles Support for  Slower Projectiles Support on bosses!
 Slower Projectiles Support on bosses! 
 Spectral Throw Spectral Throw
 Awakened Vicious Projectiles Support Awakened Vicious Projectiles Support
 Awakened Brutality Support Awakened Brutality Support
 Impale Support Impale Support
 Maim Support or Maim Support or Damage on Full Life Support Damage on Full Life Support
 Slower Projectiles Support / Slower Projectiles Support / Awakened Greater Multiple Projectiles Support Awakened Greater Multiple Projectiles Support
Auras
The build runs 5 auras of which 2 are linked here because you want to link them to an  Enlighten Support.
 Enlighten Support. 
 Flesh and Stone Flesh and Stone
 Enlighten Support (level 3 or 4) Enlighten Support (level 3 or 4)
 Pride Pride
 Maim Support Maim Support
Buffs
For your convenience, you are allowed to put all of your buffs in the same item slot. Blood Rage gets you Frenzy Charges while mapping and a big attack speed buff, Ice Golem gets you some extra Critical Strike Chance. Ancestral Protector should be put down on bosses for 20% MORE Attack Speed while Vaal Haste gives you even more Attack Speed. You’re only using the Vaal portion of Haste, and should not be reserving the regular Aura part.
Aura Setup #2
This is where the rest of your auras are run, which again are linked to an Enlighten. Dread Banner is here to help Impales where a Precision is there as it gets you some solid DPS for just reserving a very little amount of Mana. Level it up as much as you feel confident with.
 Precision (level 1-10 is fine) Precision (level 1-10 is fine)
 Dread Banner Dread Banner
 Enlighten Support (level 3 or 4) Enlighten Support (level 3 or 4)
Mobility
We chose to use Whirling Blades because its super fast and feels amazing! Because you can’t jump ledges with it, you’re using up your last socket on a  Leap Slam here.
 Leap Slam here.
 
                                                         Blood Rage
 Blood Rage Summon Ice Golem
 Summon Ice Golem Ancestral Protector
 Ancestral Protector Vaal Haste
 Vaal Haste Whirling Blades
 Whirling Blades Faster Attacks Support
 Faster Attacks Support