Halo of Spores

Level 2
You are surrounded by invisible, necrotic spores that are harmless until you unleash them on a creature nearby.
When a creature you can see moves into a space within 10 feet of you or starts its turn there, you can use your reaction to deal 1d4 {b} to that creature unless it succeeds on a CON saving throw against your spell save DC.
Level 6 1d6 {b}
Level 10 1d8 {b}
Level 14 1d10 {b}
“I drift unseen—waiting, watching, ready to rot what dares come near.”