Kryos-Ignar, the Twin Dragon

Where to find

World boss – may awaken in the regions of Act 4:

• Drysand Waste
• Tower of Damnation
• Sunken Sanctum
• Ashcauldron
• Mistwild
• Ysra's Chamber
• The Frozen Rift
• Stone Giants' Pass
• Frozen Crown
• Cave of the Stone Giants

Loot

• Ash Quiver100%
• Elixir of Heroes100%
• Golden Treasure Chest100%
• Weapon Costume Chest100%
• Ashwing50%
• Azurelight100%
• Gold Bar100%
• Ruby100%
• Sapphire100%
• Emerald100%
• Onyx100%
• Moonstone100%
• Radiant Blessing Essence100%
• Shadow Charger Seal75%
• Mist Charger Seal75%
• Dread Key IX100%
• Dread Key X100%
• Imprint of the Warlord100%
• Imprint of the Blight100%
• Imprint of the Thunderhand100%
• Imprint of Piercing100%

The chance applies to a monster of your level; if the monster is much weaker than you it drops less often, and events can raise it.