I have this Summond Minotaur with me that just showed up after the Shadow Over Hackdirt quest. I just rescued Da-Mar (?) and did fast travel back to the stables. That's where the minotaur first appeared. I didn't summon it and it won't go away, I can't talk to it or anything. It just in front of me in battle and kills most stuff before I can so I don't get anything for blade/block. Anyone know how I can make this go away? Is this normal? I just finally switched from Morrowind and this is the first time I've played Oblivion.

This sounds like an issue with one of the mods you are running. I have never heard such a thing in vanilla Oblivion. There is no spell for summon Minotaur. The ones in the game are all hostile unless you command them, but that would wear off rather quickly. The only other thing I can think that could possibly cause this is if you had used enchant to fortify your Personality to well above 100. If your Personality is high enough things will stop attacking you. But even that does not seem consistent with what you are describing. Are you running mods? It is probably related to a mod.

Definitely a mod.

Either that, or you're character is more charismatic than you think.