Elpis quests in EW, my headcanon is that the reason for Emet's grumpiness and general dislike of relationships is because he was once involved with Venat during "his misspent youth" (back when she still held the seat of Azem) but of course, it all went badly and he's never moved on from that, also explaining why he took such an interest in the WoL in ShB, and is also annoyed at them in Elpis, seeing this person with the soul of his ex's successor and protege is a bitter reminder of those wounds that still sting 12000 years later (that's the problem when you touch the sun, you're inevitably going to be burned.

)
Of course Hythlodaeus knows about it and cannot help but gently tease him about it, which only adds to the grumpiness.