Briars of Sin

with the material or your staff you stab yourself and take 1d6 piercing damage, all the while thick, bloody, spikey vines emerge from the ground in 10 feet radius originating from you dealing 3d6 piercing damage. those within range must make a dexterity save, on a save; half 3d6. on a fail 3d6 piercing damage

At Higher Levels  

at level 6 another ring of thorns emerge the same range and area dealing additional 3d6 piercing damage total 2 times 

at level 8 another ring of thorns emerge the same range and area dealing additional 3d6 piercing damage total 3 times