Lord Galahad Sanctuary Mission (Inferno Clan)

Mission to kill 9 targets in Inferno, including Unredeemed Mordeth. Six are in the Unredeemed Temple, but the 1st is in the Unredeemed Barracks, and the 5th and 6th are in the Dark Marshes

Insignias mandatory to pop final Unredeemed boss :
Insignia of Lord Mordeth × 6

This mission will still be running if you recently acquired the Garden key, but if it needs refreshing, head to Garden of Galahad (Inferno Clan Garden) to meet with Forrester Gal Zean, 372 × 411

1. Fortuitous Man-Lum Mord: Inferno Barracks, 3027 × 957. Across the bridge from east to west Next three targets are in the Unredeemed Temple. Use the stairs at the back 3725 × 3415 × 4605
2. Follower Eckel Wox Mord is all the way at the back. Turn right at the Prophet boss' altar room? - AO-Universe's directions to it are unclear enough to not bear repeating, but you can try them if you feel especially intuitive
3. Fortuitous Man-Fes Mord
4. Hypnagogic Yutt- Chi Mord
Time to leave the Temple for now. The next two targets are in the Dark Marshes:
5. Celeth Kuir, The Custodian 1768 × 727 - upper right corner
6. Erath Suir, The Custodian 1948 × 723 - East of the previous Custodian
Back to the Temple:
7. (Inferno's Unredeemed) Prophet. Time to kill the Temple boss
Acolyte Senior Gal Bela spawns. One and only one team member with six Insignias, speak with them. They begin a summoning ritual :

"This is GUARANTEED to work. I have always made it when I had six of these before. Everyone ready then?"

The acolyte lays the insignias on the pedestal and starts chanting. They shout "Enter the beast!", and numerous entities appear at the altar
8. Omega Sir Vortigern
Many adds. Be ready for Mordeth spawning directly after, with even more adds. It is worth holding off finishing off Vortigern until everyone is at peak readiness
9. Unredeemed Mordeth

The Key to Lord Galahad's Sanctuary

Possible Loot includes:
Sword of Lord Mordeth
Sword of Sir Galahad
MBS (maximum beneficial skill) on the Galahad used to be lower, and the drop rate higher; the MBS are now equal, so probably the drop rates are equal now also