Kragnos is the big nasty mini coming soon for Age of Sigmar. In this preview, Games Workshop goes over a bit of his history and lore as well as lets you download his whole warscroll so you can see just what he'll be capable of once he hits your tabletops.
From the article:
The name of Kragnos was a forgotten one – not since before Sigmar’s reign has he walked among the Mortal Realms. Now, he’s set to return in Broken Realms: Kragnos this Saturday. Whether you’ll be following him into battle or desperately shoring up your defences against his attacks, it pays to learn all you can about the god of earthquakes.
Before the time of men, duardin, aelves, and even greenskins, the entirety of the Ghurish Heartlands was ruled by many monstrous races that towered over the lesser mortals of the era. One of these tribes was the Drogrukh, powerful centauroid beings that, despite their great strength and capacity for war, lived in harmony with the land.
Legend has it that Kragnos was born to the rulers of Donse, the central nation of the Drogrukh, and while his people were content to only take what they needed to survive, Kragnos wanted more. Scolded for beating his brother to a pulp over the right to court the same mare, the bad-tempered warrior struck out across Ghur with only a small band of trusted companions for company.