Is it possible to increase the range/area of a Dragonborn's breath weapon?
If yes, how?
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While it is difficult to prove a negative, the Dragonborn's Breath Weapon isn't a magical effect, so does not benefit from any feats that affect magic.
There are feats that affect Dragonborn specifically, but the only one that relates to breath weapons simply allows you to expend your Breath Weapon's use to create a fear effect.