Legendary Dragon Kings

Lore
"These three dragons have reached the pinnacle of wisdom, valor, and awareness, and become legendary rulers of dragonkind."

Acquisition
Introduced on August 13, 2017. Can be obtained:
 * by completing all Feats during Events.
 * by completing the Monthly Feats (starting September 2017).
 * for 30 Dragon King Eggs at the Item Exchange.

Name origin
?

Additional Info

 * The card is bound.
 * Evolves with another Legendary Dragon Kings.
 * Once reaching (Tier 23) Legendary Dragon Kings, a Youthful Dragon Trio is required to evolve further (currently up to (Tier 26) Legendary Dragon Kings).
 * The card may be used to evolve any non-fully evolved card.
 * Not usable with certain cards:
 * cards acquired from the Komora Stone Exchange
 * cards requiring Custom Evoluton (with crets) or Special Evolution (cards from the Art of War card pack for example)
 * Event Skill cards during their matching event period
 * Exclusive Promo Cards, like Login Bonus cards