Na's Arcane Pierce

1st-level evocation

Casting Time: 1 action

Range: Self(15-foot line)

Components: S, M (a rapier or similar weapon, worth at least 1cp)

Duration: Instantaneous

A piercing projectile of arcane energy forming a line 15 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 2d8 magical Piercing damage on a failed save, or half as much on a successful one.

At higher levels: When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 and the length of the line increases by 15 feet per spell slot above 1st level.
Additionally, when you cast this spell using a spell slot of 2nd level or higher, the damaged creatures also must make a Constitution Saving Throw. A creature gains a -1 penalty to AC for the next minute on a failed save, or no effect on a successful one.

Class/Race Requirement: Eldritch Knight