Mending

Cantrip (transmutation; arcane, transformation, utility)
Class(es): Bard, cleric druid, paladin, sorcerer, wizard
Casting Time: 1 minute
Range: Touch
Target: One object
Components: V, S, M (fragment of equine bone)
Duration: Instantaneous

You repair a single rip or break in the target object (for example, a cracked goblet, torn page, or ripped robe). The break must be smaller than 1 foot in all dimensions. The spell leaves no trace that the object was damaged.

Magic items and constructs may be repaired in this way, but their magic is not restored. 

You gain a knack die on maintenance checks if you are able to cast this spell on the item you are treating.