In the official version of artificer, the ability to create a homunculus servant is gained at 6th level. Among its other abilities, the homunculus can:
Channel Magic The homunculus delivers a spell you cast that has a range
of touch. The homunculus must be within 120 feet of you.
Further:
The homunculus regains 2d6 hit points if the mending spell is cast on
it
Mending has a range of touch. Is there any reason an artificer cannot use the spell to repair his homunculus servant so long as it is within 120 feet?
Best Answer
Yes, the homunculus can channel a Mending spell to itself
Since Mending has a range of touch, it can be delivered through the homunculus using its Channel Magic ability. And the rules explicitly call out that touch-range spells can target the caster (or in this case, the deliverer):
Hence, the homunculus can use its Channel Magic ability to deliver a Mending spell cast by its master to itself.