https://gamerant.com/baldurs-gate-3-bg3-where-find-kuo-toa-festering-cove-location-entrance-hidden-underdark/
There is a whole race called the Kuo-Toa that can go completely undiscovered in Baldur's Gate 3 unless players find a secret entrance.
kuotoafesteringcoveguide
https://biblehub.com/job/7-5.htm
My flesh is clothed with worms and encrusted with dirt; my skin is cracked and festering.
jobfleshclothedworms