Haywire

If any spell success check is below 5 it backfires, if it's above 95 it becomes a haywire spell. A backfired spell can fizzle out, or explode in the caster's face. A haywire spell is of higher magnitude and can have additional effects.
Upon rolling <5 or >95 roll a d10 to determine the effect.

Fail:
1-2: the spell does it's full damage to the caster triggering a minor haywire effect.
3-4: the spell does half it's damage to the caster.
5-7: the spell explodes in a small AoE around the caster, affecting the caster and anyone nearby with a status effect, appropriate for the spell's element (fire causes minor DoT, kinetc spells knock down, etc.)
8-10: the spell fizzles out, doing nothing.

Hit:
1-2: the spell gains a small status debuff attached to it based on it's type
3-6: the spell does 25% more dmg
7-8: the spell does 50% more dmg and causes a minor haywire effect
9-10: the spell does 75% more dmg and causes a major haywire effect


Summons, buffs/debuffs, static non-targeted spells and sustained spells trgger haywire effects only for a few turns, before returning to normal.

Upon backfiring, there's a 1 turn cd to all of the caster's spells.