its only availble in beta version but can buy undead berserker armor in the evil shop at shadow fall(500 ac) or if its the class you are after you can buy it for 5000 gold at upgrade shop in battleon.
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well you will have to pass the beta test and the beta tester badge in oct 10 2008
Beta shop was deleted after the game was pronounced released. Although the shop was deleted, the Beta Berserker remains in game.
It was during a event and you can no longer get it.