Cursed Summoner

Cursed Summoner closes out School Grounds Act 5 in Story mode, also appears as the boss of the limited Creator Spotlight event stage, and headlines School Grounds Expedition as both the fifth fight in its elite gauntlet and the enemy that assaults the defended payload once the main battle progression ends.

Creator Spotlight reuses School Grounds' full enemy roster rather than introducing anything new, so any strategy that works against Cursed Summoner in Act 5 carries over directly.

In School Grounds Act 5, Cursed Summoner's wave runs the Sprinter, Tank, and Summoner modifiers. Sprinter and Tank appear on separate Basic-tier enemies elsewhere in the wave, trading health for speed or speed for health respectively, while Summoner is fitting company for a boss named after summoning: enemies carrying that tag periodically call in extra Basic-tier reinforcements while they are alive.

Like every Boss-type enemy, Cursed Summoner carries a hidden tag adding a flat 20% health multiplier and a 30% speed penalty on top of its listed stats, with incoming Stun and Rewind effects capped at 10 stacks rather than fully blocked.

In School Grounds Expedition, Cursed Summoner also directly assaults the defended payload once the main battle progression ends. That assault runs a two-phase mechanic, hitting for 50 damage roughly every 6 seconds while moving at speed 1.8, the same attack numbers String Demon uses against the payload in Rose Kingdom Expedition.

Clearing the reinforcements from the Summoner modifier matters as much as damaging Cursed Summoner directly, since letting adds pile up during the Story fight makes the encounter snowball out of control.

During the Expedition payload assault, positioning units to sustain enough damage output before the 6-second attack window comes back around is the main check, since the two-phase mechanic gives a brief window to react between hits.