The Tome of Fate (2012), p9 — The Changer of Ways

Yet another way to describe Tzeentch is in contrast to Nurgle in the pantheon of the Gods of Chaos. Typically, the Changer of Ways stands in opposition to the Lord of Pestilence, just as Khorne, the god of blood and skulls, opposes Slaanesh, the prince of decadence and depravity. Where Nurgle represents Chaos as entropy, Tzeentch represents Chaos as energy. Where Nurgle promotes decay and atrophy, Tzeentch promotes potential and progress. Where Nurgle fosters deterioration and ruin, Tzeentch fosters germination and development. To many students of the Dark Powers, the (however speculative) ideological descriptions of the Changer of Ways make better sense when juxtaposed against those of Nurgle, Tzeentch's seeming antithesis amongst the Ruinous Powers.