For my part of the project I basically built the environment and added all the props.

I used the marketplace to dowload assets to create the castle and the Landscape tool to build the mountains and all the terrain. After building the landscape I created the water with the water plug-in in Unreal Engine. I used Brixel to download the materials for the landscape and assets such as weapons, chains, traps... Finally I downloaded a recked car and a boat from CGTRADER and imported into Unreal Engine.