Adult Silver Dragon
Vallorex is an Adult Silver Dragon who is in the debt of our heroes.
Some of her eggs had been stolen by a group of humans, half-orcs and orcs and were shielded by an Arcane device preventing her from getting within several hundred feet. The party destroyed the device, allowing her to retrieve her eggs.
In return she gave our heroes a silver whistle that they may use to summon her “in their time of great need”.