Wither and Bloom
2nd-Level Necromancy
Casting Time: 1 action
Range: 60 feet
Components: VSM (a withered vine twisted into a loop)
Duration: Instantaneous
As in Strixhaven: A Curriculum of Chaos except the last paragraph, which reads:
In addition, one creature of your choice in that area can spend and roll one of its unspent Hit Dice and regain a number of hit points equal to the roll plus its constution modifier plus your spellcasting ability modifier.
Source: SCC 38