I feel overheal is a bit too strong in specific moments. If you don't have certain AOE spells or skills (for example with Ranger) getting into Ice Caves with wolfes 40hp each is impossible to get through.
The game is great, thank you!
Oh, you mean ice shield, it's a different mechanic. Overheal is on things like the orc battle priests.
As a ranger you should be able to snipe the priest with a power shot through the wolves using perfect aim 2, and a tunnel shot to finish if required. If you don't have the tools to handle an area however, its always fine to skip it.