Am stuck at 15/16 i need the knowledge of waragon cave and i searched ingame on the web but couldnt find an answer, any one that knows what to do would really be nice

Did you complete the main quest? Topography is usually earned just by entering the area, which you will if you just followed the story line.

hey yes i did am already on my way to mediah, i did all the green quests aswell

made a new char, did all the quests till south mediah, and still i didnt get the knowlegde, and my friend has so what am i doing wrong?