you can keep the healers from attacking by making them have to heal. That keeps their attack from increasing too much before you can deal with them. I think the rats (and other enemies like them) are weak to stun, they are kinda annoying though. Draining enemies you can't let focus on one target, they focus on whoever has the lowest xp total, so you don't always have to taunt. However if there are 3 of them ether run or take them down as fast as you can, you still earn more than you lose if you're quick enough. Tanks aren't a problem if you don't trigger them to taunt. This is everything I've noticed while playing this update, all you have to do is figure out the order to take out the enemies.