Witch
Blood Mage
His Scattering Calamity is one of the most fun skills in the game. It uses simple interactions and has extremely high base damage with no mana cost, allowing us to make full use of mana scaling through the staff and 
Archmage.
The skill is obtained via "The Unborn Lich" staff. It would normally function in a manner similar to 
Ember Fusillade where you would channel for a while, and then embers would be sent flying to enemies. By reducing out skill effect duration, we can make it so that these projectiles fly out immediately, and using Sione's Temper we only have to press out attack button 5 times before sprinting into the next pack of enemies while everything gets destroyed thanks to that and our 
Cast on Critical. We make use of 
Arc and 
Snap in our Cast on Critical setup for insane clear. Feel free to swap out both of these for 
Comet and Concentrated Area for bossing if you are lacking single target.
We use 
Mind Over Matter to convert our mana to our EHP and can sustain the high life costs from archmage thanks to Lifetap and 
Vitality Siphon. We make use of 
Mana Remnants to keep our mana topped up constantly while mapping, adding an extra layer of survivability. Once you have enough spirit, we can make use of 
Thaumaturgic Generator and 
Charge Regulation for a huge bonus to our crit chance.
Please read the notes in section 4 [Equipment] - I have included stat priorities for each piece of gear. The gear equipped in the loadout is gear I personally wore, and as a result, some items in the medium budget have stats that don't benefit us (like adds x physical damage to attacks)
This build can be played from Lvl 78 onwards (Use a lvl 18 His Scattering Calamity). If you need to level a Witch, I can reccomend ED Contagion or Plants.
You can use a perfect jewellers orb on this staff for a 5 link and a Perfect Flux to level it lvl 20 (Keep in mind this might be more expensive than just buying a lvl 20 staff)
Get some form of "Recover mana on kill" to be even more comfortable when mapping (Ring or Jewel).
I put a version of the build together on a 2D budget and cleared a T15 with 1 portal: https://youtu.be/ps2Ob1JxkeE
REQUIRED FOR BUILD (DO NOT SKIP THIS):
182 Spirit (20% quality on Archmage) & (20% quality on Cast on Critical) or 181 Spirit if one of them has 23% quality.
Pay attention to weapon set points or the build will feel bad (Weapon set 2 used for all skills, Weapon set 1 for 
Elemental Weakness only)
FAQ:
Q - Why are my wellspirites not shooting out as fast as yours?
A - Make sure you have allocated the correct weapon set points, and that your staff is in your actual weapon set 2 (Press X if you are on PC to check). Double check your support gems.
Q - Can I use 
Mageblood or 
Headhunter?
A - Yes, just switch back to 
Ingenuity if you are going to do a pinnacle boss.
Q - I can't activate all my spirit buffs
A - Please read the spirit requirements in "Build variants". In many cases you are missing quality on Archmage or Cast on Critical
Q - How much crit chance should I have?
A - Around 60% (If you are on the medium budget or lower) is fine
Q - Whats the best way to improve my damage?
A - A better staff, + Spell Skills, Mana, Critical hit chance/Damage
Q - What stats should I be looking for on my gear?
A - These are detailed in section 4 "Equipment". Your gear does not have to look exactly the same as mine, use this as a guideline.
Q - I am running out of life when fighting bosses/mapping
A - Get some form of recover life on kill/recover mana on kill. Make sure you have allocated: 
Arcane Remnants and Vigorous Remnants
