Fire Emblem Warriors is a 2017 hack and slash action role-playing game co-developed by Omega Force and Team Ninja, and published by Koei Tecmo in Japan and Nintendo internationally for the Nintendo Switch and New Nintendo 3DS. The game is a crossover between Koei Tecmo's Dynasty Warriors franchise, and the Fire Emblem series developed by Intelligent Systems. The story follows the quest of Aytolis's twin royal heirs to defend their realm when the king of neighbouring Gristonne starts summoning an evil dragon, with the gameplay combining the arena-based action combat in Dynasty Warriors with relationship and weapon systems from Fire Emblem. The game was supported with downloadable content adding additional playable characters during 2017 and 2018.