Ultimate Dominion (http://www.u-dominion.com/?r=49)

It's called Ultimate Dominion and it's a browserbased
RPG/Strategy game in which you can grow your character stronger,
kick other peoples ass, join a clan in a quest for world
domination and participate in arena battles for glory from time
to time.
If you need help to get started I suggest reading the
helpfiles first and if they don't help you can always use the
chat to communicate with the other players.

Come and join the fun!