Ooze Essence Pendant

This pendant contains a swirling drop of acidic ooze suspended in a thin layer of magical energy. While wearing this pendant, you gain resistance to acid damage. Additionally, once per long rest, you can use your reaction to unleash a wave of psychic energy. All creatures within a 15-foot radius must succeed on a Wisdom saving throw (DC = 8 + your proficiency bonus + your Wisdom modifier) or take 2d6 psychic damage and be frightened until the end of their next turn. If they succeed, they take half damage and are not frightened.