as the person above me said you can simply buy one from the Market using wealth which you receive thru pvp or doing quests
however usualy specialy Konstantin Fomenko has been really helpful and replaced most of the times lost items. if he didnt already see this thread and PM you i would suggest try to PM him explain the situation, what happend and im sure they can confirm this and than get your dragonslayer refunded.
well good luck to ya
Lord and Mayor of Meduli
ok i just saw that he acctualy did reply to this thread LOL sorry great guy he is!!!!!