I just had an arena fight reach +1380% damage from exhaustion. The enemy team had a mountain priest, and a soulslayer angel that copied soulstone splinters from me. The last enemy was the orange chaos guard that gives 50% damage reduction to itself and its neighbours. All I could do was hold e and watch as my critical hits went from doing 1 damage… to 7. Exhaustion should eventually start increasing more frequently, and in greater amounts than 20% at a time.
yep some battles can still get nutz. i dont even think that exhaustion will help, though exponential increase might.
so far only option is to run when you get into stuff like that, since its way easier to reassemble team/redo encounters.