Dragon Tribute
Dragon Tribute is a synergy upgrade in Loot Grinder, the free medieval idle clicker.
What it does
Every Dragon's Lair you own boosts your Grand Palace buildings’ output by 0.25%. (Dragon's Lairs boost Grand Palaces by +0.25% per Lair.)
Cost
It costs 15B loot and is a one-time purchase.
Why it’s useful
Synergies scale with how many source buildings you own, so they keep getting more valuable as your kingdom grows.