AMS nerf

Right now AMS backlash damage is proccing for full damage for every instance of small damage, making it incredibly punishing for builds that deal a lot of multihit elemental damage. This is likely underreported in the beta because AMS appears to never generate on randbosses, but the people that have reached the prides on 1.5 have noticed. This also obliterates NPCs pretty often, especially melee since melee attacks tend to have a ton of instances of tiny elemental damage melee_projects.

This changes it to be once per turn per enemy but buffs the damage a bit to compensate.

This is a pretty big deal and I would strongly recommend merging before 1.5 or at least changing something with AMS.