Bone Hills - The Maw of Akarkhentkats

Sort-of both, although they aren't moving from the dried-up pool. They were living crocodiles, reanimated after their natural deaths to continue guarding the pool and the hatch in the bottom of the pool.

If the elemental wants to attack them, they won't react beforehand- unless it gets into the pool, at least. If it chooses not to, again the skeleton crocodiles won't attack, so long as it stays out of the pool. If it enters the pool, they'll move towards it, shuffling awkwardly and being ungainly. The pool drying up was not planned by the tomb's architects, so the crocodiles losing the element of surprise- or the water in which they could so easily move- was not intended.

The jug is exceptionally light, and very hard.