From Ross: Rounding out the fixes in version 0.25.1, I'm responding to player feedback regarding the undead's ability to steal life from their opponent. Previously, the Liche King would steal life equal to the damage dealt (in this case three) regardless of the target's remaining life. Players felt it was hard to conceive how the Liche King could steal 3 life from a 1/1 squirrel (point taken) and that it was especially out of context for effect to steal life when damaging armor. I wanted to address these concerns without our undead fans feeling the Liche King was being nerfed. The answer: I made him more powerful (albeit in a different way) while removing the perceived exploits and keeping him within context of his abilities. First, I made it so that life steal can only drain up to the maximum power of the attack or remaining life of the victim (whichever is smaller). Then, to address the armor, I gave him the Pierce ability which has a twofold effect of depleting all armor AND disarming block. So, instead of stealing life from the armor, the Liche King now cuts through it, getting to taste the sweet sweet lifeforce within.
See both changes in action within this video. Also notice that I have added a separate smaller blue number indicator to distinguish damage to armor from damage to life.