Momonga succeeds in turning off the fear aura, marveling at how it seems much more intuitive than he expected as if he now knows all his abilities perfectly, since it seems too much to leave it on and potentially make the other players think he's hostile. In addition, he makes use of one of his racial spell-like abilities to Polymorph into a smaller and less conspicuous form: he shrinks from a 15ft tall skeletal horror to a medium sized humanoid, still shrouded in his dark robe which casts his face into shadow. His hands too are concealed behind false flesh. The overall impression is probably still kinda creepy but more in the manner of some less than savory spellcaster rather than an incarnation of death. He knew that such a disguise wouldn't fool any decently prepared max level character, but it might be enough to not make anyone else in this odd new scenario treat him as a monster by default.

He spares a glance at the others assembled there as they also take in this situation and gives his head a slight shake as the one who had cast that lightning immediately starts to fly away and addresses the others "Well, I suppose there isn't too much reason to sit around now that we have someone running off already. May as well make sure that one doesn't get into too much trouble." He starts to follow Aethra towards the noises, though on foot.