Skeletons

Skeletons are a type of low-level, common undead, generally well known throughout Faerûn, though your average commoner certainly hasn't encountered one.
Skeletons are typically easy to hit and relatively easy to kill, particularly if the use of bludgeoning weapons and attacks are employed. Like many undead, they cannot be poisoned, and are immune to exhaustion.
Though they have a basic intelligence and may understand speech, they are unable to speak themselves due to the degradation of their bodies and the relatively low-level necromancy that animates them.
The party is laughably overlevelled to deal with skeletons now. It would take 40 skeletons to create a medium challenge-level encounter for the party.

Additional Information

Facial characteristics

Bones

Lifespan

Forever, if you don't whack them too hard

Average Physique

Bony