Cloud of Spores

You lob a heap of fungi and spores at a target,  it must make a Constitution saving throw, on a fail it takes 1d6 poison damage and is poisoned until the end of the Cloud of Spores spell. The Cloud of Spores remains for one turn in the 5ft. square it landed, when a creature enters this square it must make a Constitution saving throw, on a fail it takes 1d6 poison damage and is poisoned until the end of the Cloud of Spores spell. 

The Spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6) and 17th level (4d8).

The time the Cloud of Spores remains increases by 1 turn at 11th level