He'll repeat it more slowly, this time happening to throw in various extra tidbits of information, like that Asmodeus (Lawful Good), Calistria (Chaotic Neutral), Dahak (Chaotic Evil), and Gozreh (True Neutral) are four examples of gods who fought Rovagug alongside Pharasma. These tidbits also happen to include the fact that gods usually negotiate their disagreements rather than directly battling over them; the Rovagug situation was very rare.
(They have no idea what to do about Merrin being alarmed about spatially-localized persistent disagreements among mortals. They can't even understand the mental concepts that flash through her mind in Baseline when she thinks about why that's alarming, they're clearly referring to math that wizards don't know.)
It would be acceptable, though a bit less convenient compared to a scheduled in-person block of conversational time, to have messages passed back and forth around inside the palace system. Iker Egobar is on duty in the palace and reachable. To be clear, if this works for Merrin she should do that.