(Taken from AllaKhazam's Magical Realm as I have not done these myself or had a chance to log the text involved yet)
Talk to Mavuin in the basement cellblock. Hail him and follow the dialogue. He will ask you to plead his case before the Tribunal, aggreeing will grant you a character flag.
Head to the area with The Tribunal, and ask them about Mavuin. Following the dialog, saying "I am prepared" to each Tribunal will give you description of the six trials.
Trial of Flame
To do this one, say "I am ready to begin the trial of flame." Make sure you are actually prepared when you say that because your group will be teleported to the event area where you will only get a few seconds before things start.
This one puts you in one of the open rooms with a pillar in the middle. 4 mobs will spawn, either imps or fIre elementals. Blementals are mezzable, imps are not. During the fights, 3 different AB's will be cast throughout the room. Searing Heat (100 fr debufflasting 6.5 min), Fiery Death (400 hp dd, 1 dispell), and Wave of Heat (200 hp per tick dot) are the 3 spells. Resists seemed decent with -350 fr, however many members of the group got important buffs such as Virtue dispelled! I assume 4 rounds then boss again like always. On a side note, you lose this trial if a mob remains in
the middle of the room (near the pillar) for around 1.5 minutes or so, so the tactic is to pull them all to the side of the room and mez them/fight them there.
Finishing this gives you the Mark of Flame.
Now talk to the Tribunal and say "what evidence of Mauvuin" and they will tell you that they have consented to hear Mauvuin's case. Head back down and talk to him and he will ask you to go see Karana and Mithaniel Marr. This will flag you to be able to enter the Plane of Storms and and Plane Valor.
Trial of Torture
To do this one, say "I am ready to begin the Trial of Lashing". Make sure you are actually prepared when you say that because your group will be teleported to the event area where you will only get a few seconds before things start.
When you start this trial, you're staring at a T intersection, if you run around to the left you'll see a cubby, and you'll realize that you are in a hallway surrounding a center room. There is a door to the center room on the opposite side from where you started the trial. 4 mobs spawn and two come from each side doMl the hallway. Mez and kill one at a time as fast as possible. These were shades and razorbeasts and hit for 280-300ish. After you kill all 4, if you were fast, a Wraith of Agony will spawn in the middle room, kill wraith (similar to ~e other mobs) and an ae heal spell will go off. Rinse and repeat for 4 rounds to reach the boss. The Boss is similar to the boss of execution, hits for 700s with an added twist of a 100 hp AE every 9 seconds that has a small knockback to interrupt spells.
Finishing this gives you the Mark of Torture.
Now talk to the Tribunal and say "what evidence of Mauvuin" and they will tell you that they have consented to hear Mauvuin's case. Head back down and talk to him and he will ask you to go see Karana and Mithaniel Marr. This will flag you to be able to enter the Plane of Storms and and Plane Valor.
Trial of Stoning
To do this one, say "I am ready to begin the Trial of Stoning". Make sure you are actually prepared when you say that because your group will be teleported to the event area where you will only get a few seconds before things start.
In this trial 4 mobs spawn, they can be rockmen, earth elementals, or spectres. When mobs are up, so are two archers (forget exact names). They are untargetable and shoot you for like 90-100 damage while fighting. Rockmen of course are unmezzable, and spectres are mezzable. The boss is the same as all the others -- melees for 700s, slowable, has an AE dot that also has a snare component to it.
Finishing this gives you the Mark of Stoning.
Now talk to the Tribunal and say "what evidence of Mauvuin" and they will tell you that they have consented to hear Mauvuin's case. Head back down and talk to him and he will ask you to go see Karana and Mithaniel Marr. This will flag you to be able to enter the Plane of Storms and and Plane Valor.
Trial of Execution
To do this one, say "I am ready to begin the trial of execution." Make sure you are actually prepared when you say that because your group will be teleported to the event area where you will only get a few seconds before things start.
This trial goes in four waves. When you start the trial, an executioner will spawn at the far end of the room. Your job is to protect the prisoners from being executed. Four waves of Mobs will spawn. Kill them as fast as you can because the Executioner moves toward the prisoners as you attempt to kill the mobs and if you are not fast enough he will kill the prisoner and your trial will have failed. Each wave goes faster than the one before it, so try to conserve mana on the early ones so that you can do some serious nuking by the last one.
After you have killed off the fourth wave, you need to then kill the executioner. Killing him wins the trial and wins you the Mark of Execution.
Now talk to the Tribunal and say "what evidence of Mauvuin" and they will tell you that they have consented to hear Mauvuin's case. Head back down and talk to him and he will ask you to go see Karana and Mithaniel Marr. This will flag you to be able to enter the Plane of Storms and and Plane Valor.
This trial is popular, and may have a wait time associated with it, as it is the easiest of the trials, and it can only be run once every 30 minutes per server on success. On failure, it can be re-run as soon as all the players from the failed trial clear out of the room.
Trial of Lashing
To do this one, say "I am ready to begin the Trial of Lashing". Make sure you are actually prepared when you say that because your group will be teleported to the event area where you will only get a few seconds before things start.
You start in a room with 3 exits. To the left and right are two little cubbies down some stairs and behind is a stairway up. Basically, 4 mobs spawn, razorbeasts hit for 360 max, stone guys hit for 450. Approach it like the other trial where you mez them all and target one to kill. Approximately 40s after spawn an untargetable mob called Scourge of XXXX spawns and will agro and hit for 208 max I believe. When this spawns, 3 spirits spawn, one upstairs and one in each of the two cubbies. If you kill these three spirits, the Scourge despawns. Once Scourge is down, fInish killing the 4 mobs to complete 1 wave. When the next wave spawns, send your killer upstairs to prepare for the spirit. Rinse and repeat this tactic through the flfst 3 waves. On the fourth wave, DO NOT kill all 3 spirits until all of the 4 mobs spawn. You will have to deal with Scourge while killing the 4 mobs, however when you kill the 3 spirits, the boss will spawn, regardless of if the 4 mobs are up or not.
Finishing this gives you the Mark of Lashing.
Now talk to the Tribunal and say "what evidence of Mauvuin" and they will tell you that they have consented to hear Mauvuin's case. Head back down and talk to him and he will ask you to go see Karana and Mithaniel Marr. This will flag you to be able to enter the Plane of Storms and and Plane Valor.
Trial of Hanging
To do this one, say "I am ready to begin the trial of hanging." Make sure you are actually prepared when you say that because your group will be teleported to the event area where you will only get a few seconds before things start.
Two mobs + Spirit of Suffocation spawn at the beginning, kill Spirit then get on a mob, another spirit will spawn, kill the spirit right away. Basically each wave will be 2 mobs and 2 spirits, but only 1
spirit can be up at one time. Razorbeasts are unmezzable, air elementals are mezzable. There will be messages to tell you how long you have to kill the spirit of suffocation before you lose. If one of the 3 hanging people falls over on the ground, KILL IT FAST , otherwise you will lose. After the spirits of suffocation are dead in the 4th wave, the boss will spawn. When we spawned the boss we had 3 mobs up that were mezzed still from previous rounds. Boss is an enchanter, hits for 720 max and rampages. He's about as tough as all the other ones.
Finishing this gives you the Mark of Hanging.
Now talk to the Tribunal and say "what evidence of Mauvuin" and they will tell you that they have consented to hear Mauvuin's case. Head back down and talk to him and he will ask you to go see Karana and Mithaniel Marr. This will flag you to be able to enter the Plane of Storms and and Plane Valor.