Slender Nightmare (5e Feat)
From D&D Wiki
As a slender, you have learned how to use your telepathy to tap into the nightmares and fears of creatures and humanoids you come into contact with, and make those fears seeming come to life and turn against them. You gain the following benefits:
- You are immune to being frightened.
- You also learn cause fear and phantasmal force, each of which you can cast once without expending a spell slot. You regain the ability to cast those two spells in this way when you finish a long rest. Charisma is your spellcasting ability for both spells.