There are at least 3 projects called "Umbral".
1 ) Band from Quito, Ecuador active since 80's and 90's. Their aesthetic respond to the social/protest latinamerican song.
2) Argentinean rock band formed in 2009
3) A gothic rock/post-punk band from Mexico City, Mexico
they released a self-titled demo in 2021, listen in the bandcamp
https://umbralmx.bandcamp.com/album/umbral
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