Degenerating Barrier

Each creature of your choice within a 15-foot sphere centered on a point you can see within range gains a number of temporary hit points equal to 1d6 + your spellcasting ability modifier. At the start of an affected creature's turn, it rolls 1d4 and loses that many temporary hit points, if it has any left from this spell.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the amount of temporary hit points gained increases by 1d6 for each slot level above 1st.