This one is annoying, but you can reset his stacks by resetting Kevin. So, either dying or getting him to zone out some how. When he respawns as you enter the quest zone, he should have the correct number of stacks.
This one is annoying, but you can reset his stacks by resetting Kevin. So, either dying or getting him to zone out some how. When he respawns as you enter the quest zone, he should have the correct number of stacks.