Codex: Chaos Space Marines (2017), p161 — Mark of Nurgle: Miasma of Pestilence

As the psyker chants in a phlegm-choked drone, a dark cloud of filth and flies shrouds his allies from view.

Miasma of Pestilence has a warp charge value of 6. If manifested, select a visible NURGLE HERETIC ASTARTES unit within 18" of the psyker. Until the start of your next Psychic phase, your opponent must subtract 1 from all hit rolls that target that unit.