Qayidd the Envoy - champion skill requires mana?

I just started a new game and lo and behold I stumbled upon a champion I haven't seen before in turn 20 - Qayidd the Envoy, who is tauted to have a special skill, "crushing blow," that cannot be defended against.  Pretty cool - it's the first champion I've stumbled on that has a usable skill (I haven't logged that many hours, so maybe this is common).  Thing is, I can't actually use the skill.  It requires 3 mana, and Qayidd doesn't have mana.  Am I missing a trick?  Do I need to imbue him with some of my sovereign's mana to use the skill?

FWIW, I am enjoying the game quite a bit, despite the crashes and oddities.  Kudos to Stardock for trying something that feels new, even if it still needs a bit of dusting up.