Where do you find the Heirloom currencies?

The Heirloom trees run on 4 currencies, each with its own source:

• Runic Fragments → by killing Hedge Knights
• Valyrian Tablets → through your Alliance and events (and the daily login)
• Dragonlord Scrolls → by holding Dragonlord Sanctums
• Amplifier Seals → on high-level map nodes (they're what advances the central Amplifiers)

Because Heirlooms are permanent, these currencies are a long-term investment: everything you spend stays yours reign after reign. The daily login hands out Valyrian Tablets regularly — a cheap daily reflex that feeds either Dragon Growth (stats) or Realm Expansion (economy/territory).