Standing on two legs, the gatekeeper skeleton is humanoid size. It is obviously aggressive and looking for a fight.
Gatekeeper Skeletons are summoned when someone tries to pass through the warding gate in Kweld Andu without Protection from Evil.
The skeleton appears immune to puncture and slicing.
You recall everything noteworthy about a gatekeeper skeleton... which is apparently nothing. They are not known to cast any recognized spells. They are known to carry loot in locked boxes.
A gatekeeper skeleton quickly disassembles into a pile of lifeless bones.