If used in a fantasy game (and chuck norris can indeed be used in a fantasy game) me may issue challenges, at any time, from anywhere on the board, and against any model. Accepting/refusing this challenge results in the models death.
The whole horus heresy hogwash is just something the imperium made up to cover the fact that they made chuck norrises coffee wrong one day-- resulting in countless deaths and the mortal wounding of the emporer.
Slaanesh the god of pleasure wasnt really created by the fall of the eldar, no, he was really created in the first and only time chuck norris decided to pull out..... untold numbers of eldar died in that glorious moment.
Necron gods? proof that chuck norris can have offspring