WoWDB

A powerful disease that deals 0 Shadowfrost damage per stack every 5 sec for until cancelled. Each time it deals damage, it gains 1 stack, and infects another nearby enemy within 0 yards if possible.

You gain 0 Runic Power whenever a target infected with Necrotic Plague attempts to attack you.

Replaces Blood Plague and Frost Fever, and is applied by any ability which applied either. This effect cannot be refreshed; it gains 1 stack instead.