The "party" doesn't have to do anything though; the Ghoran character can, if they know several days underground are going to be a thing, buy some LR potions or a wand using their own money. In-universe it's a very logical approach.
It's only 19 RP, so +0 LA basically. (LA isn't really a thing in Pathfinder, but at a certain number of RP - I think 25+? - they advise imposing a comparable penalty to that, where the average party level is increased by 1. If you're playing something really powerful like a Drow Noble, this will put you a level or two behind everyone else.)
Stat adjustments are +2 Con, +2 Cha, -2 Int.