I can't find any posts regarding this.

Rain of Ice (TB skill) ranks up as 200, 400, 600, 800 at each skill point put into the skill.

However, I've noticed that often-times, I don't get those flat numbers while fighting. Many times it'll hit for 777, or 564, or something weird like that.

Is RoI affected by armor or some other mitigation? Or am I just going crazy? The only explanation I can think of is for instances when I use it as a killing blow, then that's just all the life they have so I can't take 800 damage off of someone with only 750 life. But I swear I get uneven numbers even outside of killing blows.