Trickster Knight's Blade

You thrust the blade out towards your target; and a greatsword blade that is made of deadly energies slashes at one creature you can see within range. The target must then succeed on a Dexterity saving throw or take (2d6 + spellcasting modifier bonus) magical piercing damage, taking half on a success. The target must then make a Constitution with disadvantage; on a failure takes 2d10 necrotic damage, a success takes half damage. The target suffers an additional 1d6 necrotic damage at the end of your turn (unaffected by Constitution save).

Higher Levels. Casting this spell at 4th level or higher increases the piercing damage by 1d6 and the necrotic damage by 2d10 for every spell slot expended above 3rd.

Casting this spell at 4th level or 5th level increases the range by 5 feet.