The new Realm of Battle board called Shattered Dominion is coming out for pre-orders this weekend, and with it are some rules for the terrain boards features, including the Fell Chasm and the Arcanabulam.
You can see full images of the new board here
http://natfka.blogspot.com/2016/07/leaked-images-this-weeks-releases-realm.html
via Imgur for the rules
http://imgur.com/a/T8oXP
