I went through Dadi's guide and simplified everything as much as I could. I'm hoping this will help to lead new players through the raid.
Raid Guide: Throne of the Dread Terror
BOSS #1: RAKOTHAS
EVERYONE: If knocked back, stay away from group for 10-15 seconds. Save major cooldowns for when boss Enrages (+100% damage) at 25% morale. Two groups of 6 stand on either side of the boss to share distributed damage.
DPS: Adds spawn as we damage the boss. Use AoE to kill adds. KILL ADDS FIRST.
TANKS: Swap aggro whenever the Hemorrhage debuff wears off (every 10 seconds).
EXTRA: Powder Kegs (top of ramp) remove boss damage buff, place them near boss, but away from groups to prevent raid damage.
GAUNTLET #1:
EVERYONE: Keep LEFT and hug the rocks as you turn the corner.
KILL ORDER: Warmasters > Death Chanters > Archers > everything else.
BOSS #2: MUMAKS (Set-Akaji / Arpong-Dokh / Ku-Nerpag)
EVERYONE: Avoid glowing circles on the ground. Avoid stampeding Mumaks (spawn every 68 seconds). If you get an eye over your head, move away from the group.
LM: Keep anti-stun on the main tank at all times.
RANGED: Spread out 5m from each other.
DPS: Adds spawn as we damage boss. Use AoE to kill adds. KILL ADDS FIRST.
KILL ORDER: Warmasters > Champions > Archers > Spearmen > Boss.
OFF-TANK: Kite 2 Mumaks away from the group.
MAIN-TANK: Taunt one Mumak and tank by the DPS group. Pick up adds as they spawn.
GAUNTLET #2:
EVERYONE: The group must move together. Crushers can knock you back; be careful of your position. When Crushers die, the group moves forward.
MELEE DPS: Focus on Crushers.
RANGED DPS: Focus on Archers. Remove Corruption.
BOSS #3: VADOKHAR
EVERYONE: Interrupt boss inductions. If you get knocked back, you will get a wound, remove it ASAP. Watch for Vessel of Flame debuff (looks like the flame puddle icon). If you get this debuff, move away from the group.
MAIN-TANK: Tank boss facing away from raid (front AoE). When boss reaches 50%+ damage immunity, drag boss into the fire puddle to remove buff.
OFF-TANK: Pick up all adds that spawn. Tank adds behind boss so all enemies can be hit by AoE.
GAUNTLET #3
EVERYONE: Kill Black Númenórean Sorcerer. Kill Neghèbh, Skelghàd, and Dhàmiz (remove corruption before killing each one).
BOSS #4: THE UNBROKEN ONE
EVERYONE: Spam corruption removal on boss. Avoid vortexes. Avoid Oozing Darklings.
RANGED DPS: When corruption removal is on cooldown, kill Oozing Darkling adds.
MAIN-TANK: Tank The Unbroken One in nearby cage.
OFF-TANK: Kite Oozing Darkling adds, stay out of melee range.
GAUNTLET #4
EVERYONE: Wait at the entrance to the gauntlet. Avoid enemies walking in the middle of the road.
DPS: Single target Sellswords first to avoid damage reflect. AoE everything else.
TANKS: Pull one group of enemies at a time to the raid. Repeat 6 times.
BOSS #5: THE WOE OF KHAND / THE HIGH SORCERER OF HARAD
EVERYONE: If you get an eye, move away from the group. High Sorcerer fears anyone in melee range.
DPS: Adds spawn throughout battle. Use AoE to kill adds.
KILL ORDER: Corrupted Crawlers > Spirits > Woe of Khand > High Sorcerer.
TANKS: Keep the two bosses separated, tank them in the light.
END-BOSS #1: GOTHMOG, MORGIRITH, & DREAD-BEAST
EVERYONE: Ignore Mordirith.
DPS: Kill Gothmog, then Dread-Beast. Gothmog reflects common, westernesse, ancient dwarf, and fire.
TANK: Tank Gothmog, then Dread-Beast.
END-BOSS #2: AMARTHIEL & MORDRAMBOR
EVERYONE: Remove corruptions. Bosses knock back - don’t fall off platform. Raid splits into two groups of ranged, and melee.
RANGED DPS: Use RIGHT staircase. Kill Amarthiel.
MELEE DPS: Use LEFT staircase. Kill Mordrambor. Do not walk into forge.
TANKS: Bosses becomes immune, drag into forge to remove immunity.
RANGED-TANK: Drag Amarthiel up RIGHT staircase by the forge.
MELEE-TANK: Drag Mordrambor up LEFT staircase by the forge.
END-BOSS #3: LORNIEL
EVERYONE: Interrupt the boss. Avoid puddles.
DPS: Adds spawn throughout battle. Use AoE to kill adds. Sorcerers reflect tactical damage.
KILL ORDER: Lorniel > Sorcerers > Archers > everything else.
HEALERS: Keep the NPC alive.
END-BOSS #4: GOTHMOG (phase 2)
EVERYONE: Avoid puddles. Avoid waves of blue flames.
RANGED: Kill Risen Bones adds.
OFF-TANK: Pick up adds (Risen Bones) and drag them away from raid (east side). Avoid green clouds when adds die.
MAIN-TANK: Drag boss to west side.
END-BOSS #5: SILMAHTAR & CALATUR
EVERYONE: Interrupt the boss.
DPS: Sorcerers reflect tactical. Bosses reflect common, westernesse, ancient dwarf-make, and fire.
TANKS: Each tank grab a boss.
Raid Guide: Throne of the Dread Terror
/raid BOSS #1: RAKOTHAS
/raid EVERYONE: If knocked back, stay away from group for 10-15 seconds. Save major cooldowns for when boss Enrages (+100% damage) at 25% morale. Two groups of 6 stand on either side of the boss to share distributed damage.
/raid DPS: Adds spawn as we damage the boss. Use AoE to kill adds. KILL ADDS FIRST.
/raid TANKS: Swap aggro whenever the Hemorrhage debuff wears off (every 10 seconds).
/raid EXTRA: Powder Kegs (top of ramp) remove boss damage buff, place them near boss, but away from groups to prevent raid damage.
/raid GAUNTLET #1:
/raid EVERYONE: Keep LEFT and hug the rocks as you turn the corner.
/raid KILL ORDER: Warmasters > Death Chanters > Archers > everything else.
/raid BOSS #2: MUMAKS (Set-Akaji / Arpong-Dokh / Ku-Nerpag)
/raid EVERYONE: Avoid glowing circles on the ground. Avoid stampeding Mumaks (spawn every 68 seconds). If you get an eye over your head, move away from the group.
/raid LM: Keep anti-stun on the main tank at all times.
/raid RANGED: Spread out 5m from each other.
/raid DPS: Adds spawn as we damage boss. Use AoE to kill adds. KILL ADDS FIRST.
/raid KILL ORDER: Warmasters > Champions > Archers > Spearmen > Boss.
/raid OFF-TANK: Kite 2 Mumaks away from the group.
/raid MAIN-TANK: Taunt one Mumak and tank by the DPS group. Pick up adds as they spawn.
/raid GAUNTLET #2:
/raid EVERYONE: The group must move together. Crushers can knock you back; be careful of your position. When Crushers die, the group moves forward.
/raid MELEE DPS: Focus on Crushers.
/raid RANGED DPS: Focus on Archers. Remove Corruption.
/raid BOSS #3: VADOKHAR
/raid EVERYONE: Interrupt boss inductions. If you get knocked back, you will get a wound, remove it ASAP. Watch for Vessel of Flame debuff (looks like the flame puddle icon). If you get this debuff, move away from the group.
/raid MAIN-TANK: Tank boss facing away from raid (front AoE). When boss reaches 50%+ damage immunity, drag boss into the fire puddle to remove buff.
/raid OFF-TANK: Pick up all adds that spawn. Tank adds behind boss so all enemies can be hit by AoE.
/raid GAUNTLET #3
/raid EVERYONE: Kill Black Númenórean Sorcerer. Kill Neghèbh, Skelghàd, and Dhàmiz (remove corruption before killing each one).
/raid BOSS #4: THE UNBROKEN ONE
/raid EVERYONE: Spam corruption removal on boss. Avoid vortexes. Avoid Oozing Darklings.
/raid RANGED DPS: When corruption removal is on cooldown, kill Oozing Darkling adds.
/raid MAIN-TANK: Tank The Unbroken One in nearby cage.
/raid OFF-TANK: Kite Oozing Darkling adds, stay out of melee range.
/raid GAUNTLET #4
/raid EVERYONE: Wait at the entrance to the gauntlet. Avoid enemies walking in the middle of the road.
/raid DPS: Single target Sellswords first to avoid damage reflect. AoE everything else.
/raid TANKS: Pull one group of enemies at a time to the raid. Repeat 6 times.
/raid BOSS #5: THE WOE OF KHAND / THE HIGH SORCERER OF HARAD
/raid EVERYONE: If you get an eye, move away from the group. High Sorcerer fears anyone in melee range.
/raid DPS: Adds spawn throughout battle. Use AoE to kill adds.
/raid KILL ORDER: Corrupted Crawlers > Spirits > Woe of Khand > High Sorcerer.
/raid TANKS: Keep the two bosses separated, tank them in the light.
/raid END-BOSS #1: GOTHMOG, MORGIRITH, & DREAD-BEAST
/raid EVERYONE: Ignore Mordirith.
/raid DPS: Kill Gothmog, then Dread-Beast. Gothmog reflects common, westernesse, ancient dwarf, and fire.
/raid TANK: Tank Gothmog, then Dread-Beast.
/raid END-BOSS #2: AMARTHIEL & MORDRAMBOR
/raid EVERYONE: Remove corruptions. Bosses knock back - don’t fall off platform. Raid splits into two groups of ranged, and melee.
/raid RANGED DPS: Use RIGHT staircase. Kill Amarthiel.
/raid MELEE DPS: Use LEFT staircase. Kill Mordrambor. Do not walk into forge.
/raid TANKS: Bosses becomes immune, drag into forge to remove immunity.
/raid RANGED-TANK: Drag Amarthiel up RIGHT staircase by the forge.
/raid MELEE-TANK: Drag Mordrambor up LEFT staircase by the forge.
/raid END-BOSS #3: LORNIEL
/raid EVERYONE: Interrupt the boss. Avoid puddles.
/raid DPS: Adds spawn throughout battle. Use AoE to kill adds. Sorcerers reflect tactical damage.
/raid KILL ORDER: Lorniel > Sorcerers > Archers > everything else.
/raid HEALERS: Keep the NPC alive.
/raid END-BOSS #4: GOTHMOG (phase 2)
/raid EVERYONE: Avoid puddles. Avoid waves of blue flames.
/raid RANGED: Kill Risen Bones adds.
/raid OFF-TANK: Pick up adds (Risen Bones) and drag them away from raid (east side). Avoid green clouds when adds die.
/raid MAIN-TANK: Drag boss to west side.
/raid END-BOSS #5: SILMAHTAR & CALATUR
/raid EVERYONE: Interrupt the boss.
/raid DPS: Sorcerers reflect tactical. Bosses reflect common, westernesse, ancient dwarf-make, and fire.
/raid TANKS: Each tank grab a boss.