You see The Collector.
- Leave as long as you can.
Notes
The Collector "lives solely to collect all kinds of rare gems, crystals and minerals. Offering an item it does not already own, reportedly allows passage into its lair." (Spectulus).
Abilities
Melee (0-46+)Damage Taken From Elements
Physical 
Death 
Holy 
Ice
Fire
Energy
Earth
Drown
Location
Vega, in a cave below the stony pond.
Behaviour
The Collector will retreat at 1 to 13 (0.29% - 3.82%, deep red) health.
Strategy
Knights with 50/50 with the equipment given to you on Island of Destiny will be able to kill it. - Sorcerers, Druids and Paladins should get distance from it and kill it while running. Try to always keep walking on the ice, so it won't hurt you. Be careful Low-Level players, his attacks really hurt.