Laeral's Silver Lance

Source: Forgotten Realms - Heroes of Faerun

Level 3 Evocation (Cleric, Sorcerer, Wizard)
Casting Time: Action
Range: Self
Components: V, S, M (a silver pin worth 250+ GP)
Duration: Instantaneous

Silver energy bursts out from you in a 120-foot-long, 5-foot-wide Line. Each creature of your choice in the Line makes a Strength saving throw. On a failed save, a creature takes 3d10 Force damage and has the Prone condition. On a successful save, a creature takes half as much damage only.

Using a Higher-Level Spell Slot. The damage increases by 1d10 for every spell slot level above 3.