Hone Blade 2014

1st-level transmutation

Casting time: 1 action
Range: Touch
Components: V, S, M (a chip of whetstone or lodestone)
Duration: instantaneous

You magically sharpen the edge of any bladed weapon or object you are touching. The target weapon gets a +1 bonus to damage on its next successful hit.

Source: Deep Magic for 5th Edition (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details