It took me about a good solid week between playing one just one and learning the abilities and specs before i decided on blood. Then after ramps try i was like woo i want at least two unholy. Yes they all have heart strike and still can heal if needed. Tho you get the improved diseases the imps and then when your attacking you get a chance to get a death and decay with arms which totally kicks ass. I mean you get 3 melee on you send in your two pets then death and decay freebies times two plus if you wanted the other five. You wipe the floor and trust me i hate casters so thats why the unholy came into play cause if you think as you get higher with instances more become caster fights lol. So that magic bubble saves your ass so much. But not a problem to help you out on this. I tried frost only good thing was duel wielding but right now im trying to mix all three into one dk when i get 80 to see what i can do without and what i cant to make him the badest and if it works make all 5 that way.