Usually I am leery of these kinds of tie-ins, but this is pretty cool. You can use the mobile game to build your army or wreck shop on orc captains and warchiefs. Either way, this looks like it could be sweet.
The official announcement:
In development with IUGO Mobile Entertainment, Middle-earth: Shadow of War mobile introduces the award-winning Nemesis System to mobile devices for the first time, giving players the chance to build their own orc army and create countless personal game experiences in the process. As champions battle through the ranks of Sauron's forces against a host of unique orcs, players will have the power to destroy or dominate orcs, enlisting them in their army. Each nemesis is unique and requires a different plan of attack. It is only by mastering the Nemesis System that players can amass an army capable of waging war against the increasingly challenging forces of Sauron.
Check out the full trailer below and read more about the Nemesis system here.