How do damage amplification combos work in Dragonfire?

Plenty of effects double or amplify a damage type once a condition is met. That's the heart of every combo. Chains observed in game:

• Control effects (stun, panic and friends) → Rhysarion's and Shadowsong's fire ×1.5, Jagadrix's fire ×2, Seasmoke's physical ×2.
• Panic specifically → applied by Kalspire or Shadowrend → feeds Shadowsong's and Jagadrix's fire (×1.5).
• Vulnerable, or +15% tactical damage taken → applied by Antares and Zivern → amplifies Malachite, Feskar and Kalspire.
• First-Strike → granted by Syrax to fire allies → Caraxes hits ×1.5.
• −enemy Initiative (Jagadrix, Crimson) → all your fire rises; −Instinct → all your physical; −Intelligence → all your tactical.

The idea: one dragon sets a condition — a status or a debuff — and another cashes in the bonus. Build your army so the condition one of them applies serves the dominant damage type of the others.