What happened to the band named stain?

It seems there might be a slight confusion in the name; perhaps you meant "Staind." Staind is an American rock band known for their post-grunge sound, particularly popular in the late 1990s and early 2000s. The band went on hiatus in 2013 but reunited in 2019 for a tour and has hinted at new music. Their frontman, Aaron Lewis, has also pursued a solo career in Country Music during their time apart.