This spell is a part of the Time Distortion spell chain and is found in the Time Distortion rune stone.
Time Slow taught the posteramancer precision - the careful reach into a single target's temporal flow and the deliberate reduction of its rate. Mass Time Slow discards the precision entirely and replaces it with scale.
When this spell is cast the posteramancer creates a temporal distortion not around a person but around a place - a 4x4 space of the posteramancer's choosing that fills with slowed time the way a room fills with smoke, permeating everything within it. Any target that enters the area, friend or foe, finds their temporal flow immediately reduced. Movement rates and evasion halved, spell casting speeds doubled, the slow taking hold the moment they cross into the distortion's boundary.
The effect does not release cleanly when the target leaves. The slowed time clings for 2 rounds after departure, the temporal residue taking a moment to dissipate, leaving anyone who passes through moving at reduced speed even after they have stepped back into the normal flow. The posteramancer stands outside the distortion watching everything within it move at the wrong pace, with the quiet satisfaction of someone who has just made a very large portion of the battlefield considerably less threatening.
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