Abyssal General who broke the Planar Rift
Not much is known of Isgarik, for he was only seen by Randall Thay, Gerald Highlander, Krum Stoneheart, and Galadreal (from a safer distance). All else were slain around him. He arrived during the planar rift disaster during the war betweein Corneria and Farmonia, but was pushed back into the Abyss. Unable to defeat him, Randall sacrificed his cyrstal ball to be a focus for a Trap the Soul spell, and selled the general within. However, the Abyss fought back, and coupled with the press of Farmonian forces, the Container of Isgarik was lost.
What happened to the Container isn’t known, but it eventually came back to the hands of Randall Thay who hid it from those who would seek to use it for their own gains. This time ended when Lisa “Bad Luck” LaBurton stole it and ran to Incarnum, where a heated battle found the new bearer of the container to be Galadreal.
What the motives and mind of the demon can be anyone’s guess, but it’s a good assumption he seeks freedom, and a great terror awaits the world should that happen.