I'll be running M.T. Black's Tower of the Mad Mage adventure in D&D 5e next week.
On p. 8, there is a specter that, according to the description, has been weakened to where it can't use its Life Drain ability:
Note. The specter has been weakened by the close proximity of the chantry. Therefore, it cannot use its life drain ability.
Since that seems to be all a specter can attack with, what can this specter use as its attack?