Discussion of level 8 monsters.

Supreme Archangel is the strongest: it has the highest stats. However, the Diamond Dragon and the Hell Baron easily deal with the Phantom Horror, thanks to blindness and paralysis. In theory, the Baron can also defeat the Archangel - I haven't managed to do it, but the un-upgraded Diamond Dragon can't, because the Archangel is immune to mind control. However, full upgrade gives the Diamond Dragon a 50% chance to absorb all damage, which casts doubt on the Archangel's authority. In general, among the un-upgraded units, the Archangel remains the coolest.