The four dragons and the Dark Dragon
The dragons of earth, water, fire and wind have appeared in Aden, while the Dark Dragon lurks deep underground. Defeating them takes a whole clan.
The four dragons
Fafurion, Antharas, Lindvior and Valakas

Fafurion
Water dragonThe water dragon. Prepare sustain and mobility, and watch for phase changes.
Antharas
Earth dragonThe earth dragon. Plan your front line, melee positioning and control chains.
Lindvior
Wind dragonThe wind dragon. The fight moves fast, so focus on pursuit, positioning and melee-ranged teamwork.
Valakas
Fire dragonThe fire dragon. Bring plenty of supplies, focus fire and stay out of danger zones.

The Dark Dragon
In the war between dragons and gods, the four dragons left their lairs one by one. Only the Dark Dragon remained, bound deep underground by a demon.
Like the four dragons, the Dark Dragon is one of the top bosses on this server and drops Event Gold Coupons.
Dragon gear showcase
Dragon-themed gear from the official showcase (official image; the gear and values available here follow the in-game client)

Rewards
The main rewards for defeating bosses
Event Gold Coupons
The four dragons, the Dark Dragon, bosses of every tier and event monsters drop Event Gold Coupons. Boss events and castle sieges reward them too.
Bound Diamonds
Everyone who fights a boss shares Bound Diamond rewards based on their contribution, so party damage pays off.