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XGE has a spell that lets anything that breaths spew magical energy from its mouth for 10 rounds called Dragon's Breath (p. 154). Part of it reads:

Each creature in that area must make a Dexterity saving throw, taking 3d6 damage of the chosen type on a failed save, or half as much damage on a successful one.

It's been established that you can put it on your familiar, per Can a familiar from the Find Familiar spell use Dragon's Breath?

Do you use your own spell save DC or your familiar's? What would a familiar's spell save DC be? Seems like if it's a Dexterity save, it should be coming from the source of the fire.

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  • \$\begingroup\$ Really this question generalizes to any creature other than yourself you might cast it on. \$\endgroup\$
    – mattdm
    Commented Jun 19, 2019 at 3:52

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It is the spellcaster's spell save DC

The DC to resist one of your spells equals 8 + your spellcasting ability modifier + your proficiency bonus + any special modifiers. (PHB - Saving Throws)

So the person that casts the spell sets the DC (as indicated by the term "you"/"your" which the PHB uses throughout this section to refer exclusively to the caster).

And regardless of the familiar delivering the spell, the PC is the one who cast it.

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