“Heroes, be advised,” Dragons A.I.’s voice came over the armband, “The Endbringer Bohu appears to follow a strict pattern.  The city is condensed in twenty-four minute intervals, followed almost immediately by the miniature Endbringers producing barriers, walls, pillars, blocking apertures and more.  The next phase, occurring gradually over the next ten minutes, will produce deadfalls, pitfalls and a smoothing of terrain features.  Following that, we should expect more complex mechanical traps to appear, after which point the cycle will start anew.  Be advised that she attacks with the spikes as she enters each phase.  Disparities in reports suggest that she is feinting in some cases, feigning an inability to do so.”

Wildbow, Worm, 25.6