Rose Blade

Evocation Cantrip
Casting Time: Action
Range: Self
Components: SM* (a melee weapon)
Duration: 1 round

Target. One creature within the reach of your weapon.
Attack Roll. Melee weapon attack with the weapon used to cast the spell.
Hit. The weapon attack's normal damage, and thorny roses cover the creature until the start of your next turn. If the target fails a saving throw before your next turn, it immediately takes 1d8 piercing damage and the spell ends.
Cantrip Progression. This spell's damage increases when you reach higher levels. At 5th level, the melee attack deals an extra 1d8 piercing damage to the target, and the damage the target takes for failing a saving throw increases to 2d8. Both damage rolls increase by 1d8 at 11th level (2d8 and 3d8), 17th level (3d8 and 4d8), 23rd level (4d8 and 5d8), and 28th level (5d8 and 6d8).

Source: Homebrew