Border friction increases tension between nations. Unclaimed resource deposits dwindle.
Racial tensions between the theocratic government of Xelland and Tieflings comes to a boiling point as the theocracy effectively begins displacing the native population. Ends as nearly all Tieflings migrate to Hell's Hearth and other regions.
Lead by Iados, expelled Tieflings trek across the Devil's Sea to escape to Hell's Hearth, founding Iados' Fall.
First breach into the Clockwork Wilds
Delvers into the Clockwork Wilds encounter native Drow. Delvers react with aggression, in part due to language barriers. Various independent, Dwarvish, and Sollish parties are sent to attack the Drow. Most don't return due to the Drow's massive advantage in numbers and familiarity with the terrain.
First settlement is established in the Wilds.