To devour, Grab, (3 in hotkey mode) target with one hand then click yourself (you can Disarm (2 in hotkey mode) to tackle with another hand when devouring). Beware the devoured will die in few minutes due to the lack of oxygen, being seriously injured and going into pipes will further reduce the time to less than a minute. If the devoured is armed with a knife, they can cut their way out from the inside, gibbing you in the process.
Usage
Add {{Devour}} to all xenos, so you don't need to change them one by one if this changes.