(There is, very clearly, a plot afoot, one that has just resulted in a god's downfall. Asmodeus wants to know what that plot is, whether Asmodeus's interests are a primary target of it, who exactly is behind it.
He needs information.
He has a list of suspects.
Who is known to already know about, and have acted around, the anomaly? Abadar, Nethys, Otolmens, Irori, Cayden Cailean.
Otolmens need not be considered.
In the case that Asmodeus's interests are being targeted by the plot, Abadar would not have originally reached out to Asmodeus with a poisoned trade; Abadar retaliates, in such matters, but does not attack. Also the whole thing is not really Abadar's style.
The remaining gods involved, Cayden Cailean, Nethys, and Irori, are all former mortals. Formerly mortal gods do tend to be more interventionist in mortal matters, and so more likely to appear there, but still. The thought has not escaped Asmodeus that perhaps there is some common interest of the gods who were once human, opposed to the interests of the gods who never were.
Who else was clearly involved?
Gorum, Chaotic Neutral god of battle, who suddenly switched sides about whether Zon-Kuthon should be allowed to roam free. Gorum being Gorum, He might not demand to know all about it, it is not in the nature of War that all soldiers must understand why they fight; but whoever contacted Him and successfully brought Him on board was probably somebody whose purpose Gorum finds sympathetic.
Iomedae is formerly human, and her work often conduces to Gorum's ends. And Iomedae now holds the key to a certain vault. But Iomedae will only use that key under certain rigidly defined conditions; holding it does not clearly benefit Her by much.
And if you consider this entire plot, it does look, a bit, more in the style of Chaos than of Law, or at most Neutral on that axis. To be a god is not to have the nature of carrying out strategies that some third party might see as nothing but otherwise-featureless choices of paths to final consequences; if that were so, there would be little overt difference between Lawful and Chaotic ones. Gods drink more deeply than that, of their own natures, and Lawful gods make Lawful plans and Chaotic gods make Chaotic ones.
Asmodeus will see, then, what Milani, formerly-mortal Chaotic Good goddess of revolution, will do, given a prompt to meddle in this particular issue, and perhaps that will prove revealing.
Manipulating Otolmens to a particular conclusion that She is allowed to reach is easier than with other gods, because Otolmens does not try not to be that predictable; it is unfortunate that most of the conclusions one might desire from Her are ones She will not reach by any pathway.)