With your Ghorkaal Teir'Dal Illusion active, speak to Tola R'Vorr
Tola R'Vorr, a Teir'Dal within Charnel Grove, told me of a secret entrance to the Primordial Malice's holy crypt.
It is located under Stillwater Bridge, within the forest of Kithicor at 778, 16, 1106
Try to defeat the Teir'Dal attackers - there are three of them, two 102vv and one 102v. When you're just about to kill the last one, you'll be teleported back to Wanderer's Dock in "spirit form".
Return to Stillwater Bridge and retrieve your body by clicking your corpse.
Return to Waulon Highpebble (turn off the illusion before you talk to him).