Dvallin's Runes of Casting Focus

You mystically energize a specially-prepared item so that it can serve as a spellcasting focus for your spells.  The item can be anything the character could feasibly hold, touch, or wear, including weapons, armor, jewelry, clothing, etc.

The item may only function as a spellcasting focus for one individual.  Usually this would be the caster, but it can be bonded to another individual if they are present during casting, touching the object, and expend a spell slot of at least 1st level to energize and align the item to them instead.  The item can be used as a spellcasting focus for any spell cast by the individual who energizes it, regardless of mystical source (arcane, druidic, divine, etc).  Once energized, the item can function as a spellcasting focus until dispelled (the caster can dispel it with a touch). 

The item must be specially prepared prior to the casting, with mystical runes engraved or otherwise permanently embedded into the object using 25gp in special materials designed to hold and channel spell energy.  Preparing such an item requires proficiency in the relevant tools or skills necessary to craft the item, such as smith's or tinkerer's tools for metal objects, or sewing needles to embroider runes of golden thread into cloth objects.  The caster must be present during the creation of the item, and if crafted by someone other than the caster there is some risk that the item's preparation may fail due to translation errors in the runecraft unless the caster makes successful Arcana check (DC 15) to guide the crafting process.  The item only needs to be physically prepared once, even if the spell is later dispelled, though the DM may rule that under special circumstances, physical damage to the item might ruin the preparation.   

At Higher Levels. This spell can be cast using a spell slot of 4th level or higher, rendering it more resistant to being dispelled (see dispel magic spell for further information).