Konran’s Black Arts power says:
The Konran grabs a nearby ally and drains life from them, reinvigorating himself. Restores X points of health to the Konran and deals X damage to a random ally.
By its own description, the power shouldn’t work when Konran has no allies. Right?
Based on the flavor text, it would make sense if it only worked when there was an ally to damage. But according to the gameplay text, that’s not actually how it works (and indeed, Konran still heals even with no allies up). Maybe they suck up the souls downed allies.
They also still damage allies even when they haven’t yet taken any damage, so I’m OK with that trade-off.