What do you mean, mass inflect wounds ISN’T in the PHB or the DMG for 5e?! WELL, HERE IT IS!
Mass Inflict Wounds
5th Level Necromancy
Casting Time: 1 action
Range: 6o feet
Components: V, S
You create a gate to the plane of negative engergy that sucks all life from an area in range. Choose up to six creatures in a 30 foot radius sphere centered on that point. Targets in the radius of the spell must make a Wisdom saving throw. Those that fail take 5d10 necrotic damage. On a save, the targets take half as much damage
At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increase by 1d10 for each slot level above 5th.