Should you buy Cores for your Legendaries' habits?

Cores are a good targeted buy if you have a pivotal Legendary whose key habit is stuck for lack of Legendary Cores 🟡.

Why go for Legendary habits:

• Habits are a big share of a dragon's power (up to 5 habits at lvl 5)
• ⭐ Set habits (the ones that "grant" a bonus to the Command, e.g. *Bane of Vermin* on Crimson, *Strategic Rebirth* on Syrax) multiply the active Command
• In-game habit events confirm that each dragon's 5th habit is the strongest

Do: focus your Cores on one Legendary you actually play, to unlock/raise its ⭐ habit. Avoid: buying Cores of a rarity you don't use, or sprinkling them over bench dragons.