My best run, destroyed by the Aoe Mob T-T In late, my imp get 5000 atk and hit 5 time per turn dealing like 25K dmg/ turn (ennemies gets 50k hp so I needed 16 turn to clear a map.) I've could go way further if maze and aoe mobs didn't existed. (without it, protected by my tons of bees, i've could hit 300 or more easily)
It seems to me that also those two together with the Black Knight are prepared so that there is no build that destroys all three. Every time I've tried something new, one of the three destroyed me. Even the Palisade, at high levels, requires so many hits, that if you don't have the Crow you can hardly do anything. The attack and health of enemies are disproportionately scaled from 100.