Skeletons are enemy mobs, notably boss skeletons. They appear as undead equipped with a chestplate, shoulder pads, and a horned helmet. Skeletons can be found in a variety of difficulty levels, sizes, and colors.
There is also an identical looking playable class with the same name.
Although skeletons have identical combat skills to most other humanoid mobs, larger skeletons have considerably more health points than standard mobs. These are often dubbed as Skeleton Bosses, and will begin appearing in the the dungeon by dungeon level 5. These can also be encountered on islands.