False Life
You gain 2d4 + 4 Temporary Hit Points.
Using a Higher-Level Spell Slot. You gain 5 additional Temporary Hit Points for each spell slot level above 1.
False Life 5e 2024 vs. 2014 edition differences
The 2024 version changes the duration from 1 hour to instantaneous, and increases the base temporary hit points from 1d4 + 4 to 2d4 + 4. The higher-level slot benefit remains the same, but the total temporary hit points are higher in 2024.