Patch 5.3 is now available in Final Fantasy XIV and players can now access the Extreme version of The Seat of Sacrifice. This Trial drop Ilevel 495 weapons, the Gwiber of Light Trumpet and various other rewards.
Unlocking The Seat of Sacrifice Extreme FFXIV 5.3
To unlock The Seat of Sacrifice in Extreme difficulty you will first need to clear the normal version of it that is unlocked during the 5.3 MSQ. You will then be able to directly talk to the Minstreling Wanderer located in the Crystarium (X: 7.5 Y: 12.5).
And that's it, you can now access the Seat of Sacrifice Extreme and farm your loot. The Trial is made for 8 players (2 Tanks, 2 Healers, 4 DPS) and is a good opportunity to get a nice weapon before the update of the Relic Weapons.