Thunderclap

does not have a Twin Dragon form due to the way it is acquired.

How to Acquire
can only be acquired by summoning or buying it. This can be accomplished by assembling three artifacts to upgrade the Dragon Training Base. The three artifacts are:


 * Vial of Lightning Bolts
 * Reaper's Scythe
 * Warhammer of Justice

The artifacts are built by collecting five fragments for each artifact, totalling 15 fragments. These fragments can be acquired through city raids, through winning battles, or purchased with Volga Gold. A complete set of 30 fragments would cost 3,450 Volga Gold.

Mechanics
Activate: can be activated once every two days using the "Destroy It" button. Upon activation, 3 cities of your choice will be annihilated to smithereens.