Burst the Soul Cage the instant it appears in the north, keep the boss away from it, stand on the White Tiles, and watch your own damage reflection. Pick a vocation — the other four are AI-controlled.
Prototype trainer: the Soul Cage's 14-second burst window, its north spawn point, the White Tiles' ~3-second telegraph, and the damage-reflection escalation (100%→~200%+ per failed Cage) are sourced from a verified fight-mechanics writeup, not a guess. Exact HP/damage numbers, spawn timers, and AI positioning are trainer-scale starting points, not official figures. Dreadful Harvesters are modeled as persistent aggro-management adds the Elite Knight has to keep Challenging, not a DPS-race target. The wall-trap 'box' strategy (Knight pinning themselves between the boss and all four adds) is only explained in the help panel, not simulated. The Soul War's Trials aren't modeled yet, only the Goshnar's Malice boss room itself.