Mictlan doesn't really have heavy infantry. I saw the AI throw big big Groups of troops at me containing warriors (a bit too many without armor) and jaguar warriors, eagle warriors, and sun warriors. Unfortunately I don't think he blessed the eagle warriors which is sad. I don't want to spoil them for you but they're a really cool unit idea.
For mictlan elite troops are just sacred, only sun are really better armored than standard, and i think they have only 11 prot.