It is a different one every time.
The answer changes everytime to who did it,
You get Paladin class in AQWorlds from Artix in Swordhaven (he is found in the inn).
Type /join yulgar
At the SleuthHound Inn, refer to links below for further information.
Type /join sleuthhound WITH the backwards slash.
Yulgar is the innkeeper at the Ye Old Inn in BattleOnTown.
The culprit change every single time
possibly the brawler dagger at yulgar's inn
sleuthhound inn type /join smuurvil and kill the smuurvils
The Hardy Dagger is dropped by the Harmoire in sleuthhound inn (/join sleuthhound).
In Yulgar's Inn (/join yulgar). It is in the left room upstairs.
I think that you have to go through the giant tale in yulgar inn