Temple of Marr is Halls of Honor B. You need all three Halls of Honor Trials flags to zone in.
Lord Mithaniel Marr is west of zone-in. If he is visible, he is up. He is untargetable until all three mini bosses are dead. The minis and Marr respawn in 3 days.
The room
Pull An Honorable Protector (100k) and An Honorable Protector of Marr (150k) out of the room first. Always Calls for Help. They respawn in 12 to 15 minutes.
The minis can be pulled one at a time. Kill all three.
Halon of Marr — North. Beastlord. Slowable (60% mit). Rampage. Dual Wield. Hits 1234. 200k HP. Blinding Beauty is a single-target blind and 1s stun (Magic -150, 60s recast). Denial is a proc (1500 DD + 1s stun, Magic -150).
<Halon of Marr> - CH Chain: 4sec, 6sec slowed, Hits 1234, Rampage, Dual Wield, Slowable (60% mit), Casts: Blinding Beauty (Single, Blind + 1s stun, Magic -150, 60s recast), Procs: Denial (Single, 1500 DD + 1s stun, Magic -150), 200k HP
Edium, Guardian of Marr — South. Paladin. Slowable (65% mit). Rampage. Dual Wield. Hits 1438. 200k HP. Protection of Marr is a proc (2000 DD + Root + 95% agro, Magic -200).
<Edium, Guardian of Marr> - CH Chain: 4sec, 6sec slowed, Hits 1438, Rampage, Dual Wield, Slowable (65% mit), Procs: Protection of Marr (Single, 2000 DD + Root + 95% agro, Magic -200), 200k HP
Ralthazor, Champion of Marr — In front of Marr. Paladin. Slowable (65% mit). Rampage. Dual Wield. Hits 1600. 275k HP. Champion’s Protection is a PBAE (65% snare + 40% slow, Magic -150, AoE 100, 180s recast). Strike of the Champion is a proc (1000 DD + Root + 1s stun, Magic -150).
<Ralthazor, Champion of Marr> - CH Chain: 2sec, 3sec slowed, Hits 1600, Rampage, Dual Wield, Slowable (65% mit), Casts: Champion's Protection (PBAE, 65% snare + 40% slow, Magic -150, 180s recast), Procs: Strike of the Champion (Single, 1000 DD + Root + 1s stun, Magic -150), 275k HP
Lord Mithaniel Marr
Once all three are dead he is targetable. Keep the fight in his room. If he is pulled toward the hallway he ports home, wipes hate, and heals. Have someone other than the main tank eat Rampage.
He is Slowable (80% mit). Rampage. Dual Wield. Hits 2096. Attack delay 12. 1.2M HP.
Silence of Marr is a single-target root (Magic -200, 3s recast). Blinding Essence of Purity is a 3s stun and blind (Magic -200, 60s recast). Interrupt Touch of Nife (1125 heal, 5s cast). Strike of Marr is a proc (3500 DD + 3s stun, Magic -150).
<Lord Mithaniel Marr> - CH Chain: 1sec, 2sec slowed, Hits 2096, Rampage, Dual Wield, Slowable (80% mit), Casts: Silence of Marr (Single, Root, Magic -200, 3s recast), Blinding Essence of Purity (Single, 3s stun + Blind, Magic -200, 60s recast), Touch of Nife (Single, 1125 heal, 5s cast), Procs: Strike of Marr (Single, 3500 DD + 3s stun, Magic -150), 1.2M HP
After the kill
Hail the Planar Projection. It only answers the killer’s raid or group, lasts 10 minutes, and can give up to 144 flags. You need all three Halls of Honor trial flags for that hail. Then hail Grand Librarian Maelin in Plane of Knowledge.