First time playing this mode and this boss seem severely bugged in merc mode.
It states 15 damage to those that haven’t acted.
It did not work like that at all.
If I had 2 that acted before him, he did 15 damage to those 2.
If I had 1 that acted before him, he did 15 damage to the 2 that didn’t act.
If all 3 acted, he did 15 damage to all.
If none acted, he did 15 damage to all.
In any case he ALWAYS hit the 2 or 3 that acted first or lack there of.
His skill should state “Will always hit the highest amount of minions that act or does not act”.