A Fae Mhor rite of worship to the demon Lolth, held unspeakable by the elves
Part of this was inscribed on a piece of parchment found in a Karennal library, and read and memorized by Hildraft using his Ta'nara abilities. An extract runs:
"Quarval-sharess Lolth, al'yorn mrigg-wun, ninta xund"
(Great Goddess Lolth, guide your (favoured) servants as they strive in your cause)
He later, very unwisely, started reciting it in a Belamir ale-house, only just managing to stop before quite literally raising Hell. However, the urge to recite the ritual still bothers him from time to time.