What is the most dangerous star ever found?

The most dangerous star ever found is likely V838 Monocerotis (V838 Mon), a red supergiant known for its explosive outbursts and extreme luminosity. When it erupted in 2002, it briefly became one of the brightest stars in the Milky Way, emitting a powerful shockwave that could potentially disrupt surrounding space. Its unpredictable nature and immense energy output pose significant risks, especially if such a star were to go supernova. However, it's important to note that the term "dangerous" is relative, as V838 Mon is not currently a threat to Earth.