Here you can find what dragons are needed for collections and how to get them.
We start with the current collection.
To get Uller Dragon #1010 you have to collect orbs for the following dragons and summon them:
- Winter Comet #1006
- Winter Star #1007
- Winter Sun #1008
- Winter Moon #1009
How to get orbs:
You will be able to find orbs for all the 4 Heros of Winter Dragons in the following places:
- The Season Island
- The Weather Machine
- Heroic Race
- Temporary Quests
- Alliance Chest
- Warrior Chest
- Orbs Shop
- Video Ads
- On offer for you to buy.
So keep your eye out if you need to get more.
Edit: screenshot