Vultros is a rare spawn that hangs out in the area around Sentinel Hill. He's only a level 26 and he's not elite, so there's nothing special about taking him down.
The reason people look for him is he tends to drop a rare dagger, the Talon of Vultros. This dagger has the following stats:
23 - 44 Damage
Speed 2.00 (16.8 damage per second)
+5 Agility and +2 Spirit
It's a level 21 dagger, so those are really good stats.
Analar and snowy with the dead Vultros.