Darkmaster Gandling

Headmaster's Study
Return to the central study after defeating its surrounding teachers and clearing their rooms. Keep the routes back from those chambers clear before starting Gandling. A player sent through Shadow Portal must defeat the Risen Guardians in the destination room and return to the group.

Darkmaster Gandling
Elite HumanoidGandling tests whether the remaining group can survive losing a player while the isolated player clears a portal room and returns.
Abilities

Shadow Portal
Teleports an enemy to one of 6 locations within Scholomance.
If Shadow Portal sends you to a closed room, defeat its Risen Guardians to reopen the exit and return. Clear the destination rooms before pulling Gandling so ordinary enemies do not join that isolated fight.

Curse of the Darkmaster
Reduces an enemy's Strength by 50 and Stamina by 50 for 1 minute.
Remove Curse of the Darkmaster when possible. The loss of Stamina is particularly dangerous for a player about to fight alone in a portal room.

Arcane Missiles
Launches magical missiles at an enemy, inflicting Arcane damage.
Interrupt Arcane Missiles when possible to reduce the damage the remaining group must heal while a player is isolated.

Shadow Shield
Dispel Shadow Shield when possible. It absorbs damage and retaliates against melee attackers, adding avoidable damage while the group may be missing its healer.
Tank- Keep Gandling near the central study so returning players can rejoin quickly. Use defensive abilities if the healer is portaled away; if you are isolated, defeat the room's Risen Guardians and return instead of waiting at the gate.
Healer- Keep the tank healthy enough to cover your possible absence. If Shadow Portal selects you, defeat the Risen Guardians in your room and return; staying at its closed exit does not restore healing to the group.
Damage- Defeat the Risen Guardians promptly if you are portaled away. While you remain with Gandling, interrupt Arcane Missiles, remove Shadow Shield if able and help remove Curse of the Darkmaster before a weakened player is isolated.