Trial of the Gatekeeper

Steps

 * 1) Justinan sends you to Everfrost to work with Kaira L'or again to open the Vestibule of Righteousness. From zone in, swim to the shore, head up Bitterwind Trench, go right at Jagged Plains, thru Icespire Caverns. Kaira is at the end of it. Kaira is injured and dies when you speak to her, she warns you how strong The Guardian is.
 * 2) Enter the Vestibule by clicking the boulder where Kaira was. Mobs inside are Vestibule defenders (may be non-aggro if you've never gained their hate by killing any of the winged maidens outside), frosty pests, and frosted bubbles. Mobs range from L60-63. There are three clear globes which are the Sacred Vessels in the cave: one to the right, left, and behind The Guardian. Head forward across the bridge to The Guardian and speak to her. She gives you a puzzle to solve. If you choose the wrong one, you fight her and still gain access to the Vessels. Don't know what the right answer is, failed it.
 * 3) Once you get access, click the Vessel where The Guardian was. Then click the Vessel to the right (the one on the left as you came into the cavern), then click the last one on the right. The keys become the Gavel of Entry.
 * 4) There's a path behind where The Guardian is that leads past two mobs and to a mob named "a nobleman". You can hail him but he continues to use a pick at the wall while asking why hasn't he been noticed. I don't know what he's for, I think nothing happened because of being L72 and he was grey at L50.
 * 5) Head back to Justinian.

Rewards

 * Experience
 * Justinian's Altar of The Tribunal
 * Justinian's Altar of The Tribunal