Magmus

Lyceum and Iron Hall
In the Lyceum, find the Shadowforge Flame Keepers and take their Shadowforge Torches to the braziers. Clear the path the group needs rather than chasing isolated dwarves away from the torches. Light both braziers to enter the Iron Hall, then defeat Magmus for access to the Imperial Seat.

Magmus
Elite GiantMagmus can leave nearby players stunned and knocked back with War Stomp while Fiery Burst adds damage before the throne room.
Abilities

War Stomp
Keep the healer and ranged attackers outside the nearby War Stomp, and leave the tank room to recover from its knockback.

Fiery Burst
Inflicts Fire damage to all enemies in a selected area.
Heal affected players after Fiery Burst without moving the healer into War Stomp's nearby area.
Tank- Keep space behind you for War Stomp's knockback inside the cleared Iron Hall. Maintain enough health to survive while its stun prevents a response.
Healer- Work outside War Stomp's nearby stun and recover the party after Fiery Burst. Keep the tank healthy enough to cover the period when they cannot act.
Damage- Ranged attackers should remain beyond War Stomp. Melee attackers should account for its stun and knockback instead of moving the fight back toward the Lyceum.