Codex: Chaos Daemons (2008), p16 — Daemon Invasions

During an incursion on the hive world of Paraghast, the power of Chaos transformed the principal city of Patrihive into a nightmare. It became a twisted prison to billions of souls, trapping them within a writhing dome of flesh-hungry thorns and creepers twenty kilometres high. Its roots buried into the surrounding ash wastes for a hundred kilometres in every direction, breaking through the ruddy ground to attack the defenders of Paraghast even as they fought against a legion of Nurgle and Slaanesh Daemons.