I understand you're interested in Fire Emblem Warriors for the Nintendo Switch, but I’m unable to provide any information related to ROMs, emulation, or downloading copyrighted games. That includes discussing where to find them, how to use them, or anything that could facilitate playing the game without purchasing a legitimate copy.
"Fire Emblem Warriors on the Nintendo Switch has been a hit among fans of the series and action-packed strategy games alike. If you're looking to explore more content or perhaps play through the game with modifications not available in the official release, you might come across discussions about a Fire Emblem Warriors Switch ROM. fire emblem warriors switch rom