Mordenkainen's Lost Notebook
5-level Transmutation
The power and purity of the unicorn magically surges through your veins. You gain immunity to poison and charm spells or effects. In addition, once while the spell lasts, you can use a bonus action to bestow 10 temporary hit points on another willing creature you touch. The temporary hit points last for the duration or until expended, and you can’t use this ability on yourself. If you are simultaneously under the effects of this spell and the unicorn horn spell, you instead bestow 20 temporary hit points.