Edwin VanCleef is one of the Custom Halloween Event bosses that you need to kill as an objective of one of the quests. The boss can be found inside the Deadmines dungeon.
1. This boss like most dungeon bosses, casts a debuff named Meteor Slash that stacks. When the tank gets 3 stacks, someone else needs to pull the boss and let it expire on the tank. With groups having high gear, it can be killed without the need of off-tanking.2. After killing this boss, a dragon named Felmyst will spawn. Be careful not to taunt it, or the group will wipe.