There's five different kinds of creeps.
Minotaurs are basic melee and you get them at the start.
Archers are basic ranged and they appear as soon as your War Rank (Holding flags) goes up.
Priests and onward you have to buy from the citadel, but they come for free automatically once you do. You have to be careful when getting these upgrades, as your enemies can farm them for XP and a bit of gold.
Priests do decent damage and cast a healing spell on allies. (This spell also makes it so other priests can't heal you for a certain time.)
Angels do a bit of damage, but are best as a distraction.
Catapultasaurii do heavy damage and outrange towers. Good seige units.
Giants have lots of health and a tons of damage. They're almost like low-level Demigods themselves.
