From Pathfinder Lost Omens The Grand Bazaar, which isn't enabled.

Dragon's Breath (3rd Level Spell)

ITEM 8

UNCOMMON MAGICAL

Price 500 gp

Usage applied to dueling cape or shield

Bulk —

This rune depicts a specific type of dragon, resizing after application to fit the surface of the item.

Activate envision (spellshape)

Requirements You're receiving a bonus to AC from your dragon's breath cape or shield

Effect If your next action is to Cast a Spell with an area of effect that deals the same type of damage as the depicted dragon's breath weapon, the spell gains the effects of the Widen Spell feat. The rune can only affect spells of 3rd level or lower.

Pathfinder Lost Omens The Grand BazaarOGL