In almost every MMORPG players can duel versus each other. I really like it when I can 1 versus 1 with real life friends just to check out who is the best. :P
This is something I really miss in Guild Wars, and it shouldn’t be hard to make anyways.
Duelling
Learn to use the search function. This has been discussed far too many times already.
I stole a special snowflake’s future by exercising my democratic right to vote.