Might of the Master. The following numbers increase by 1 when the creator's proficiency bonus increases by 1: the homunculus’ skill bonuses and the bonuses to hit and damage of its Acidic Spittle.
(Requires creator's bonus action) Acidic Spittle. Ranged Weapon Attack: +4 to hit, range 30 ft., one target you can see. Hit: 1d6 + 2 acid damage. Alchemical Salve (3/Day). The homunculus produces a salve and touches one creature you designate. The target receives one of the following magical benefits of your choice: Buoyancy. The target gains a flying speed of 10 feet for 10 minutes. Inspiration. The target feels giddy and effective, gaining advantage on certain ability checks in the next hour. The target chooses the checks before or after rolling. The magic runs out after the target has used it on a number of checks equal to your Intelligence modifier (minimum of 1). Resilience. The target gains a number of temporary hit points equal to 2d6 + your Intelligence modifier.
A small construct that takes the form of what the user wants it to me when making it. It assists its creator in the their work.