Quick demo of a build that uses a +4 Support Gems Staff with a level 4 Enhance to get 150% reduced projectile speed on Anomalous Fireball.

Going to 99% reduced projectile speed slows your fireballs down to a crawl, going to 100% is the same as 99%, and going to 101% reduced makes them completely instant. The build takes advantage of that with chain and increased chaining range for clear, along with the huge amount of AoE given by Anomalous Fireball, which allows shotgunning bosses in a lot of situations. Leadership's Price is used for Sap/Brittle/Scorch which results in around ~250% more damage for the build.

The build is not optimized, it's just a showcase. The original idea was to have 102% reduced projectile speed normally with the setup I have now and a few nodes on the tree, then to activate an alt quality haste for bosses to increase my projectile speed down to 100% reduced therefore slowing my fireballs down to not moving. The goal was to cast a ton of Fireballs and then lure the boss into it and explode them all, but this turned out to not be very reliable because the hitbox was so small and because 100% reduced speed fireballs still move. Probably a fair amount that should be done differently, but the build works okay and is fun.

Currently bandit is Kraityn (may change that), and PoB is https://pastebin.com/xWSHkx6Y.