Their identity is the Kaldor Gang. What is unique about this gang is that, unlike other gangs that are at odds with the Empire, they are a gang that is fanatical about the Emperor.
Warhammer is a worldview where ‘miracles’ really exist, so they also show strange miracles.
It is said that there are cases where suicide bombers survive despite committing suicide.
To be precise, even if you self-destruct, there is a certain probability that you will only lose consciousness, so it is possible to wake up and self-destruct again.