Skeleton

Skeletons are an aggressive type of enemy found on Level 2.5, 3, 4, 5, 5.5 and 6. They are weak to Impact and Crush damage, but they will likely make up for this by wearing some armor.

In the Catacombs (level 2.5)
Skeletons found in the catacombs are aggressive, wearing varying degrees of rusted plate armor. One such set of armor can be found on a skeleton wielding a two-handed sword in the cemetery area of the floor. Level 2.5 is the earliest area the player can see Skeletons, and will usually catch players off guard due to Skeletons being much better skilled than Undead.

In the Sewers (Level 5.5, 7.5)
A variant of the regular Skeletons are found on the Crossroads Sewers and the Market Sewers in the form of Infected Skeletons, which have flesh stuffed behind their bones. They are functionally identical to regular Skeletons, wielding rusted weapons and armor. However, they are also weak to slash damage due to their exposed flesh. Unlike the other skeletons they cannot be controlled or reanimated using Mind thaumaturgy, nor can they be detected by Mind Sense.

On other floors (Levels 2.5-6)
Skeletons eventually come to replace regular Undead on later floors, alongside Ancient Undead. They are aggressive and wear random pieces of the armor found throughout the floor, usually as a Rusted or Crude variant. On Level 4, however, the Brass Plate Armor skeletons wear will not have any existing modifiers such as Rusted or Crude. The enemies wearing rusted red armor on Level 5 are also Skeletons unlike the blue Blade Masters also found there.

Overall Behavior

 * Most are aggressive, but will flee from a fight on occasion. Occasionally, one might also encounter benign skeletons in the Crossroads.
 * They are found in similar areas on every run, as they tend not to wander too far from their initial spawn. Some Skeletons, like the Armored Skeleton Swordsman on Level 2.5, never wander.
 * Skeletons always flee from Sir, but will also attack him when his attention is focused on a different character, including the player.
 * Skeletons will have Novice or Adept level AI.