By Royal Decree I is a quest available in Dragon's Dogma: Dark Arisen.
- "In the name of the mighty conqueror, King Theodore the Bold, you are hereby ordered to offer up the corpse of a dragon of thunder in tribute."
Slay the Thunderwyvern that dwells at the top of the Bluemoon Tower.
This quest becomes available immediately after slaying The Dragon in The Final Battle.
Once accepted a Thunderwyvern will replace the Wyvern usually found at the top of Bluemoon Tower.
Slay the dragon to complete the quest and to receive the rewards.