Innervate

7th-level Evocation
Casting Time: 1 action
Range: 30 feet
Components: VS
Duration: 2 rounds

You channel natural energies into another creature, refreshing their minds and bodies. The target regains 1d12 mana immediately, and 1d12 additional mana at the beginning of their turn for the next 2 rounds.
At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the target regains 1d12 mana for an additional turn for each slot level above 7th.

Source: Homebrew