Minecraft Mob Ideas - Tormentor

20/07/12 EDIT: Changed model to avoid copyright, changed name and edited description. Also added to clues for ideas. If you find them first, you get a prize.
Seeing as I've got Techne again, I decided to make Dementors, as suggested. If you guys have never heard of them, read Harry and the Prisinor of Azkaban. Or watch the movie. To be honest, the books better.

Tormentor
Mob Type: Aggressive
Health Points: 30
Attack Damage: 3 (easy), 4 (normal), 6 (hard)
Spawn: Tundra Prisons
Drops: 1-5 Chain[link] 0-3 Ectoplasm Balls[link]
Experience: 5
Tormentors, like their ghost cousins, burn directly in sunlight but unlike ghosts they are extremely rare.Any water or glass which they touch is transformed into ice which gives them the ability to walk 'over' water. They also have the ability to float 3 blocks higher thentheir height in the air, like ghosts.