Glutton

Spiral of Thorns
Glutton patrols the bottom of the spiral. Clear a space for that fight, then follow the winding ramp to Amnennar at the summit. Look for the rare Ragglesnout during the climb and continue if he is absent. Follow the ramp instead of trying to cross the gap near its entrance, and finish each caster pack before the next patrol reaches it.

Glutton
Elite UndeadGlutton pairs Disease Cloud damage around him with Enrage's faster, harder melee attacks against the tank.
Abilities

Disease Cloud
Keep the healer and ranged attackers outside the cloud around Glutton. Standing behind him does not avoid its damage to nearby players.

Enrage
Save tank mitigation and stronger healing for Enrage's increase in attack speed and physical damage.
Tank- Fight Glutton in space cleared of the spiral's patrols. Use mitigation when Enrage appears; turning him away does not remove Disease Cloud damage from players standing nearby.
Healer- Stay outside Disease Cloud so its ticks do not compete with your tank healing. Keep stronger heals available for Enrage rather than spending them on avoidable cloud damage to ranged players.
Damage- Ranged attackers should stay outside Disease Cloud. Melee should step away if its ticks and Enrage overwhelm the available healing; attacking from behind still leaves you inside the cloud.