Ascertain the location and condition of the Vilii stone, see if there's anything he can do from the physical side of things. Possibly gain access to Malicant's physical form (if it's in the same place as him in the Dreaming) and see the same.

Sorry for nitpicking, I was under the assumption that a psychic attack causing physical damage was different than psychological damage which is what I'm understanding to be the actual outcome of the attack?