Diggle's Magical Fusion

You touch a nonmagical weapon. That weapon permanently becomes a magic weapon with a +2 bonus to attack rolls and damage rolls. Additionally, you can touch a nonmagical arcane focus (Meaning no Wand of the Warmage, Rod of the Pactkeeper, or similar magical items).  That Arcane focus permanently becomes a magic focus with a +2 bonus to attack rolls and saving throw DCs. Finally, You touch a nonmagical set of armor or a shield. That set of armor or shield permanently becomes magic armor with a +2 bonus to the AC.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the bonus increases to +3. When you use a spell slot of 9th level or higher, the bonus increases to +4.

If you are an artificer you may extend an attunement slot takes the spell's level up by two (Maximum level of 9).