Sacrifice Sanity (5e Spell)
From D&D Wiki
|Casting time:||1 action|
You rip away a portion of the fabric of your mind, and use it to harm another. Choose a target that you can see in range. They immediately take 1d6 psychic damage. However, you have disadvantage on all saving throws until the start of your next turn, as it takes some time to fully recooperate.
At Higher Levels. This spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).