Drow grammar: https://tuelean.redbrick.dcu.ie/Junk/Drow-Dictionary.pdf
Drow dictionary: http://www.eilistraee.com/chosen/language.php?page=common
Drow ways down
Since the path through the labyrinth in the Garden of Silver Parade is the only path that leads directly to the Domain of the Silver Folk, drow have their own magical options when it comes to getting out or in their homeland:
some hills that are older than time are in fact camouflaged halls leading all the way down, the magical door opens when a drow gets close enough; when the moon is full or one is blessed with magic, they can spot the frame of the doors
drow have even ways to create new paths; they can poison a tree, so it rots and gets hollow, they can then crawl through its trunk and roots - the poison affects the nature around, so if one finds an area with blight and dead plants, there might be a path to the Underdark nearby
there are certain enchanted ponds and rivers that become a portal once the moonlight hits their surface – drow keep the locations of them secret and any outsider that finds out cannot speak of them, the drow are not afraid to take hostages to ensure silence or use more efficient and permanent methods to keep them quiet
spiders are more important to drow that one would think; if correct words are said to a spider, it will weave magical sigils in its web, those webs can then be turned by the drow into portals