Dwarf "no debuff deathblow" ...
I'm sorry if this has already been posted. I did search around and didn't see it yet.
Also, I know dwarves are already quite powerful, so this probably is not a high priority (not like the wraith spawn bug I just lost a game because of, but I digress...).
But I've found that an anihillator's "direct hit" debuff does not apply when it kills a previously unaffected unit (as in, with one hit).
More easily explained with this video:
The first round, I attack & kill the necro in 2 hits. First hit debuffs necro. Second hit kills necro. Debuff stays.
The second round I'm boosted by the paladin's aura, and can kill the necro in one hit. No debuff on the knocked out unit.