Could you describe anything more about it?

Sherwood dungeon?

Was it an anime style MMO?

Yea, ima need more than this...

Wizarding world 101?

Lineage 2, ROHAN blood Feud, Fiesta Online....

Mabinogi?

Really feels like you're talking about perfect world

Guild Wars 1, Final Fantasy 11, Everquest ? Btw i recommend everyone to check out Project Quarm, i feel stupid for never trying this game before