Indestructable Skeleton

Skeleton spawns in open daylight.
Skeleton does not burn.
Skeleton does not move.
Skeleton does not take damage from weapons or potions.
Skeleton 'levitates' when blocks bellow him destroyed.
Skeleton can be moved with a slime block on a sticky piston (moves 1 block).
Skeleton does not take harm from lava.
Skeleton may be destroyed with TNT.