[Remnant]

Tech advances:

Geology:
Deep Mining: Rysan engineers have developed methods for creating stable mines deeper in the earth than was possible prior.

Construction:
Mandible Ship: These thick hulled covered cargo ships are able to move through the ice-strewn sea lanes surrounding Rysa, using a large grinding device to clear a path. Though ponderous, they will enhance Rysa's ability to trade with other nations.

Biology:
Sub-terrainian farming: Though limited to mushrooms and some tumors, the groundwork has been laid to develop methods of growing food beneath the permafrost of Rysa's surface.

Defense:
Caelum Cruoris: A series of bunkered cannon which fill a great space of the air with shards of metal. Effective without aim against incoming air units, but unlikely to bring down the largest, heaviest airships.

Seamanship:
Waterflow Studies: Through careful observation, Rysan navigators have developed a method of sucessfully predicting and navigating the iceflows around the continent. The field of study is useful for all manners of tight navigation.