Maddening Hex

[ Maléfice accablant ]
Prerequisite: 5th level, hex spell or a warlock feature that curses

Description not available (not OGL).
But here is a summary:

Deal Cha.Mod. psychic damage within 5 ft around the target cursed by your hex spell or one of your warlock feature.
Xanathar´s Guide to Everything
  1. DnD 5e Eldritch Invocations › Maddening Hex