Please do not double post and use the edit. It's not MoS.
In this game the taunt skill has mediocre effect. I, as a Ranger, can still pull aggro with my combo. The best way to keep aggro is to do the most damage so you'd want, at the least, nicely upgraded weapons.
Essentially any class can 'tank' as long as they have enough HP. Defense only really plays a role if you're out on the map aoe grinding. The bosses require you to have a crap load of HP instead to cushion the hits. Hopefully in the upcoming patches they'll have it so that dragoons are much more capable of tanking because not everyone will spend hundreds of cs items for normal gameplay.
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Shaman is a great class. It's tricky though. A lot of people seem to think they're useless. But they are able to heal overtime and cast buffs that reduce enemy damage as well as increase critical hit rate for others. If you learn how to use it it can be a pretty powerful class. And heck, I can even kite with a shaman too.
