The Arena scenario has three custom god powers with it:
-Doombringer (Nidhogg): A dark fireball falls from the sky and damages all nearby units.
-Zeno's Deathtrap (Lure): Set a trap in the field. When a unit walks over it, spikes will shoot out of the ground, impaling nearby units.
-Something that I forgot the name of (Ragnarok): A magical seal appears and expands from Arkantos for a short time. After a couple seconds, dark energies surge through the seal, killing anything they touch.