А тут изучают язык Темных Эльфов?

Принадлежность кому-то или чему-то (possessitive)

Coincidentally, the possessive case in the Drow language is very similar to the Common Tongue used by most races. The possessive case is completed with "'s" except if the word ends in "s" where upon "'" is added

Nindil zhah lil Valsharess' elgluth {That is the Valsharess' whip}
Sarn lil velg'larn's inthen {Beware the assassin's schemes}