Era beginning/end
The old Heroes of Legend, Agni Amelani, Dlisn Mountain-Cutter, Kiri Yashmoto, Glinlam the Shaman, and others storm the Talthorian Temple under the cover of dawn and accidently blow up the Shard of Magic that was within. New Talthoria is mostly leveled and the 'Heroes' with newfound abilities that made them more powerful than the average powerful Talthorian, wrought destruction through the whole north. The Talthorian colony is set back thousands of years of work, with no way to recover.