Go to the Temple of Growth ( -449, 49, -857 ) /waypoint -449, 49, -857 and click the urn
The praying urn is only up when a big group of guards around it is up. You have to either sneak to it or pray while fighting (golems see invisible, it is possible to sneak between them, but very difficult)
There is also another urn in the same room, guarded by only one mob, this urn can also be used
Return to the altar tablet ( -129, 72, -972 ) /waypoint -129, 72, -972
Go to the library and inspect a book on one of the tables near ( -395, 48, -949 ) /waypoint -395, 48, -949
This is a random book among the many, called "The recent history of Felwithe".
Kill smiths ( -384, 46, -748 ) /waypoint -384, 46, -748 until you get:
instructions
the hilt
the blade
the blade sheath
Return to the altar tablet
Right- or double-click on urn at ( -679, 85, -1158 ) /waypoint -679, 85, -1158 to start ring event. The urn takes a bit to start the event. All but one archway will be blocked when it starts
You have to kill 3 waves consisting of several non-linked elemental mobs each:
Return to the altar tablet. You will receive sacred garments
Go to Pool of Purity ( -185, 60, -150 ) /waypoint -185, 60, -150 and enter it while wearing the sacred garments. The quest will auto-complete.
Note: But beware when trying to leave the pool, thinking that you can jump onto the surround rail, as you are suddenly catapulted into the midst of a group of 1x lvl 64^^^ heroic and 3x lvl 64!