"I couldn't guess what weird spells would enlighten an outworlder!  Tap Inner Beauty sounds to me like one of those weird spells you resort to at the point where you're trying to do something really difficult and stack four slightly different bonuses that wouldn't stack right if they were the same bonus.  So Truthtelling, Tap Inner Beauty, and you ask for whatever's left to be Comprehend Languages?"

"I couldn't guess what weird spells would enlighten an outworlder!  Tap Inner Beauty sounds to me like one of those weird spells you resort to at the point where you're trying to do something really difficult and stack four slightly different bonuses that wouldn't stack right if they were the same bonus.  So Truthtelling, Tap Inner Beauty, and you ask for whatever's left to be Comprehend Languages?"

(They're not sure Erecura has gotten the news from Cheliax; they don't want Merrin making any open-ended requests.)