I build up some courage to download the current version of skyrim a couple of weeks ago so I'm currently updated.

So some time ago I got 90 on Conjuration and finished the Conjuration Ritual spell by defeating the unbound dremora given by Phinis Gestor.

So my question is what was the purpose of doing this? What benefit came out of it? Still to this day the unbound dremora still hangs out at the very same location to which I had summon him. He won't even talk to me, and when I try fighting him he just stands there.

This seems like a waste of time and energy.

I thought that he was to be summon to get you things.

He's for the sigil stone and that's it.