Wither and Bloom

V, S, M
You invoke both death and life upon a 10-foot-
radius sphere centered on a point within 60ft.
Each creature of your choice CON ST, 2d6
necrotic damage / half. Nonmagical vegetation
in that area withers.
In addition, one creature of your choice in that
area can spend and roll one of its unspent Hit
Dice and regain HP equal to the roll plus your
spellcasting ability modifier.