2: The Shrine of the Crusader

The Elder Scrolls IV: Oblivion Guide - Knights of the Nine

2: The Shrine of the Crusader

The Crusader's Shrine is underwater near the Imperial City bridge. With 'The Shrine of the Crusader' set as the active quest, follow the arrow on your compass to stone door to Vanua and proceed inside. There are various undead creatures in this area, so be careful. If you're not equipped to face these enemies, turn back now and get your hands on a silver, enchanted, or Daedric weapon.

Once in Vanua, start following the arrow on your compass. When you reach a room with four Welkynd Stones atop some pillars, look for the Press Block across from the northwestern pillar. Activate the Press Block to open up a door through the adjacent wall. Follow the arrow on your compass to the entrance to the Shrine of the Crusader.

The Helm of the Crusader is in the Lost Catacombs, which can be accessed through the Shrine of the Crusader.

In the Shrine of the Crusader, follow the green arrow on your compass to find the corpse of one Sir Amiel. The journal found on Amiel's corpse tells of the Knights of the Nine and their headquarters, the Priory of the Nine. Be sure to take the key from the corpse as well. Use the key to unlock the Iron Gate on the western wall in this room. A hole in one of the walls in this room leads to another area. You won't be able to take the Helm of the Crusader just yet, so proceed through the wooden door to the Lost Catacombs.

Once in the Lost Catacombs, follow the arrow on your compass and you will soon reach a door back to the Shrine of the Crusader area. The Helm of the Crusader lies before you; take the relic into your inventory to complete the quest. Simply hop down from this platform to avoid having to travel through the Lost Catacombs again.