Very unique concept and special rules. This looks like a mission you have to purpose-build a list for. The movement penalties for getting off terrain are extremely harsh. I feel this mission will heavily favor certain armies while severly hampering others.
Viewing post in OPR Grimdark Future Mission - Burning Seas jam comments
Thanks for the feedback! Your right on that last point about the mission favoring some armies (like the elven jesters, which have strider on every unit. Ridiculous lol). I made double sure though that every army does have ways of dealing with the movement rules. Even the daemons which don't have any transports (not including some titans).
My goal was less to make something perfectly balanced, and more to focus on a fun, thematic scenario that forces you to think differently about how you build your army. Thats my excuse at least. Could be a terrible one :)