Highlord Mograine is one of the bosses that comprise The Four Horsemen, the last encounter of the Deathknight Wing in Naxxramas.

Background

Former leader of the Scarlet Crusade and father of Scarlet Commander Mograine. He wielded the sword Ashbringer against the Scourge until he fell in battle. Now he is a slave to the evil Kel'Thuzad, but longs to be freed from his corrupted state.

Abilities

The Four Horsemen share the same base abilities, an undispellable Horseman Mark named after them that does more damage as it stacks and a unique ability.

• Summon Spirit: When each horseman dies, his/her spirit is summoned out, stay at the place and keep giving out marks. Do not go near them, they can one-shot melee range target. This means the safe zone will remain the same even after you killed some of the Four Horsemen.
• Shield Wall: Cast at 50% HP and 20% HP for 20 seconds.
• Enrage: At 100 marks cast, horsemen will enrage and use their abilities with no cooldown. This is roughly 20 minutes time.
• Mark of Rivendare: Debuff with a extremely large range that inflicts increasingly large amounts of unresistable damage, stacking up to 99 times. Lasts 75 seconds. Is re-applied every 12 seconds. Cannot be removed. Typically 4-5 Marks is the limit for a player to take before dying.
• Unholy Shadow: Unique ability. 2,160 - 2,640 frontload damage + 4,800 DoT in 8 secs. Mitigated by fire resist. Applied as a 25% chance on melee hit to proc.

Strategy

Each Horseman must be taken to a separate corner, and tanked there. Whilst having one Mark stack up will do too much damage and kill you, it is possible to have all 4 marks stack to a lesser extent, and survive. For example, four Marks of Mograine (3000 damage per tick) hurts a lot more than one Mark from each (no damage at all).

This of course means you need to be able to rotate the Tanks in and out, otherwise they will die from the Mark stacking too much. The problem is that you would then need to have a second Tank be able to reliably taunt and get the aggro from the original tank when you rotate them out. The range of these debuffs is huge.

Loot

After The Four Horsemen are defeated, the Four Horsemen Chest can be opened to retrieve the dropped loot for the encounter.