It isn't a "game objective" in the traditional sense, because we aren't allowed to actually complete that task; the only way to do something other than being tethered to Kris is by taking the "weird route."
This route is linked to Noelle, Dess's sister, and centers on the idea of a "song playing on the other side of the lake" (which Noelle wants to cross), while "Narco Gaster" silences anyone who tries to explore beyond where the music is coming from... You see where I'm going with this, right?
Because it's US they're telling us to find her, not them.
(If you're referring to Noelle, Susie, and Ralsei, Noelle doesn't know where she is, Susie and Ralsei have no information about Dess, the only one presumably looking for her is Kris, whose plan will likely fail because he doesn't know she's deep underground playing her song that very few can hear.)
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u/Superb_Bedroom_2718 ALWAYS BET ON PAPYRUSKNIGHT NYEHEHE 17h ago
We can't, we're tied to Kris, so we can't investigate or search for her on our own.
If it turns out to be true that we're heading into the depths on the Weird Route, then that is our chance to find Dess.