Cindar

From Melvor Idle

Cindar is a pet that can be received from the Stronghold of Dragons with a 1/250 chance. It provides a permanent bonus of +2% Damage To Bosses.

To challenge the Superior version of the stronghold, you must first equip all 3 of the Augmented Dragon enhancements, and to challenge the Augmented version, you must first equip all 3 of the regular Dragon enhancements.