Dungeon Mobs

Nothing has been posted in this section for a while, so I thought I'd post.

I started a project a while back to build an open dungeon-crawler type of gamemode for players on my server, and I'm thinking of starting it again soon due to the release of MythicArtifacts enabling players to have unique abilities. I was wondering if anyone had any suggestions for mobs for this dungeon, as it will consist of multiple tiers and is meant to have an adventure aspect to it as well.

Thanks!