False Life

Artificer    Sorcerer    Wizard

Level 1 Necromancy

Casting Time: 1 action
Range: Self
Components: V, S, M (a small amount of alcohol or distilled spirits)
Duration: 1 hour

Bolstering yourself with a necromantic facsimile of life, you gain 1d4 + 4 temporary hit points for the duration.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, you gain 5 additional temporary hit points for each slot level above 1st.

Source: Player's Handbook, p. 239