Bragnak's Life Harvesting

You sacrifice undead creature under your control instantly killing it reducing its body to ash. Transforming its necrotic energy into pool of healing energy equal to the half of its current hit points (rounded up). You can then divide the pool between up to two willing creatures of your choice (that you can see) within range to restore a number of hit points equal to the healing energy used.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can choose additional undead creature under your control for every two slot levels above 2nd.