Eleneryn's Blooming Blossoms

Beautifully delicate flower blossoms dance through the air filling the 30ft sphere centering on the caster. Anyone caught in the radius must succeed on a CON saving throw or take 3d8 poison damage and are poisoned. Creatures that succeed take half damage but are not poisoned. 

Creatures that begin their turn in the sphere or enter it for the first time during their turn must make a CON saving throw or suffer the effects of the spell. The caster can select which creatures within the zone are not be affected by the spell. 

For each level above 3rd the spell deals and extra d8 damage or the range can be extended by another 10ft