How do I get Cores to upgrade dragon Habits?

Cores are used to level a dragon's Habits (level 1→5). They're tied to rarity:

• Rare Core 🔵 → upgrades Habits on Rare dragons
• Epic Core 🟣 → Epic dragons
• Legendary Core 🟡 → Legendary dragons

To level a Habit you need 2 items: a Breedmark (tied to the dragon's breed) plus a Core of the right rarity.

Where to find them:

• The Market sells Cores (Rare / Epic / Legendary).
• Chests and events hand them out (notably the Habit Growth event).
• The store (dedicated offers).

Since Legendary Cores are rare, save them for your key Legendaries rather than sprinkling them around.