Large, piercing diamond clusters burst from the ground in a 5ft. wide and 90ft. long line directly in front of you. Each creature in the line must make a Dexterity saving throw. A creature takes 6d8 magical piercing damage on a failed save or half as much damage on a successful one. 

Each square in the line is occupied by sharp diamond clusters. A creature that moves into or starts their turn in an occupied squared takes an additional 3d8 of damage. Once a square occupied by the diamond clusters has dealt damage the diamonds disintegrate and no longer deal damage. The diamond clusters are 3ft. tall and can provide cover.  They have an Armor Class of 5 and 20 Hit points. The diamond clusters are shattered if dispelled.

When you cast this spell using a spell slot of 4th or higher, the damage increases by 1d8 for each slot above 4th. The diamond clusters also become 1ft. taller and gain 10 health points for each slot above 4th.