Empower Companion

You permanently imbue your existing familiar or a similar long-term magically-linked companion with improved abilities. The effects endure through unsummoning, summoning, and bodily changes as long as the creature has the same memories and personality. You can only grant the effects of this spell to one creature at a time.

Most effects of this spell, as well as its material cost, are based on your total caster level**. You can recast the spell on the same creature to update the effects when you reach higher caster levels. The empowered companion gains the following benefits:

• The creature's proficiency bonus becomes equal to your own, if it is not already higher.

• The creature's unarmored Armor Class becomes 10 plus its Dexterity modifier plus 1/3 your caster level (rounded down), if it is not already higher. 

• The creature's number of Hit Dice become equal to 2 plus 1/2 your caster level (rounded down), if they are not already higher. Hit points increase accordingly.

• If the creature's number of Hit Dice increase to or past a multiple of 3, one of its ability scores increases by 1, it gains proficiency in 1 new skill, and it becomes proficient in one new type of saving throw.

This spell does not affect any limitations imposed on the creature, e.g. a standard familiar's inability to attack. It does not change the creature's Challenge Rating. If the companion's magical bond with you is broken, the effects of this spell immediately fade.

** For multiclass characters, use the same method as determining spell slots, but counting Warlock levels as full normal caster levels.