Find a book about Cauldron Hollow as mentioned by Arqis. The book can be found in the following locations:
at the Academy in North Freeport ( 11, -7, -128 ) Copy/waypoint 11, -7, -128
in the Three Towers in South Qeynos, opposite from Sage Indis Surion ( 708, 82, 127 ) Copy/waypoint 708, 82, 127(yellow portal)
at the Library of K'Lorn in Neriak ( -686, 18, 248 ) Copy/waypoint -686, 18, 248
at Research Library in Kelethin ( 137, 108, 175 ) Copy/waypoint 137, 108, 175
Right click the book and inspect it to get a list of books in this stack.
Read the Vanishing of Cauldron Hollow book.
Return to Arqis in Nektulos Forest ( -283, 0, 172 ) Copy/waypoint -283, 0, 172.
Speak with a fairy named Dalninia on the island in the Torrent River in Nektulos Forest ( -198, 0, -343 ) Copy/waypoint -198, 0, -343.
Get Dalninia to help you by proving yourself to Queen Thayilia, queen of the Asilian fairies in the Nektulos Forest ( -499, 2, -292 ) Copy/waypoint -499, 2, -292.
Queen Thayilia ( -481, 4, -303) will ask you to slay Queen Dyleena (Level 29^), ruler of the rival Sullian faeries, found near Bone Lake ( -742, 145, -2199 ) Copy/waypoint -742, 145, -2199.
Note: Attacking Queen Dyleena will summon multiple Sullian Royal Defenders (Level 28) to her aid. The defenders are not linked to Queen Dyleena, and do not have to be killed for this quest.
Enter the Funeral Pyre ( -960, 12, -715 ) Copy/waypoint -960, 12, -715 and get a quest update. The Knights of the Beacon will spawn and attack when you enter the Pyre.
If you are doing this in a group, then each group member must enter the Funeral Pyre to receive an update before killing the Knights, or they will not receive credit.
Kill the Knights of the Beacon (level 27) that spawned when you entered the Pyre. There are 3 of them and they are between vv and v.
Visit the Treant named Rulinthus, found in the far north end of Nektulos ( 2, 89, -1977 ) Copy/waypoint 2, 89, -1977, near The Obelisk of Lost Souls portal and the druid ring.
Kill Tilberbous (Level 29^), found just south of the Funeral Pyre ( -1051, -2, -581 ) Copy/waypoint -1051, -2, -581.