Seal of Command works nicely itself, but stuff effecting it seems to be completely broken.
Judgement of Crusader - 100% coefficient. Boosts damage ridiculusly after rank 4 Seal of Crusader.
Benediction - does not affect the the seal, so burns mana a lot faster.
Sancity aura does work, but testing it with Seal of command does not seem to increase the damage of it, gota do more testing tough.