Vectus

Viewing Room
Open the classroom with Rattlegore's key. The students and lecturers begin neutral, so pass without attacking if skipping the classroom event. For the encounters, use Dawn's Gambit from a doorway or corner, clear the transformed students, then engage Marduk before Vectus.

Vectus
Elite UndeadVectus tests whether the group can leave Flamestrike's burning ground without crowding into the nearby Blast Wave.
Abilities

Flamestrike
Calls down a pillar of flame, burning all enemies in a selected area and inflicting additional damage every 2 sec. for 8 seconds.
Leave the targeted Flamestrike area and keep moving out of its lingering fire instead of stopping after the initial hit.

Blast Wave
Unleashes a wave of flame, inflicting Fire damage to nearby enemies and reducing their movement speed for 6 seconds.
Blast Wave damages and slows nearby enemies. Keep ranged attackers and the healer away from Vectus so the slow does not trap them in Flamestrike.
Tank- Move Vectus off Flamestrike patches into the classroom space already cleared of students. Avoid backing the boss into the healer while making that move.
Healer- Heal from outside Vectus's close-range Blast Wave and leave Flamestrike immediately. Expect a slowed melee player to need healing while escaping the burning ground.
Damage- Ranged players should keep their distance from Blast Wave. Melee should leave Flamestrike even when the wave's slow makes returning to the boss inconvenient.