Armored: scales their hp and attack depending on the dificulty and the armor/weapon they wear.
Archer: basic ranged unit, equipped with a bow.
Special unit: normally a mage with powerful spells.
Depending on the biome, dungeons will be filled with these mobs, and sometimes weak armored mobs(leather,chain, or iron armor) will patrol their biome.

Plains: Skeletons:with a discomposed corpe those warriors are the weakest warriors of the dark forces of minecraftia, their special unit is a necromancer.(base armor index 1)

Taiga: Zombies: corpses in descomposition state, they follow their liche master orders, and are looking for brains! their special unit is a liche.(base armor index 2)

Ocean: Pirates: their special unit is the king pirate.(base armor index 4)

Swamps

Goblins: These creatures life in swamp caves, be care if you find one, they don’t use to go alone.

Mountains

Dwarves: This little steves will attack you in a big group, and if you find their dungeon at the core of the volcano you may find some golems, and of course a lot of valuable stuff, but, at what price?

Ice plains: The others: not many its known about them, don’t get close if you are not able to siege a skeletons castle.