The Magus Kingdom of Azervrish, the last kingdom of the Selphids. Under the rule of the [Archmage] Azervrish, the Selphids enslaved every race they could find in Baleros, until the host slaves and an alliance of various nations led to its downfall.
Goblin King War in Izril. (It was indirectly said that the war happened 10 years ago by saying that the "Goblin King’s rampage coincided with the assault on Liscor and the surrounding area by the Necromancer Az’Kerash")
The village that surrounded The Wandering Inn, when it still was in the possession of a human man, was destroyed by the undead armies. (Ch.1.07 says it was a plague that killed all inhabitants, not the undead, so it's not quite clear which one is correct)
Garen and the Hob with magic fulfilled their promise to meet again. They fought after Garen learn that his friend became a slave, and swore to oppose him if he ever tried to carry out his master plan.