Lug wasn't the smartest. He knew that. And he was fine with that. As long as he had a club to swing or a ripper gun to fire, he was content, and there wasn't much thought needed beyond that.
And like many other Ogryn, he was content to serve the Imperium and it's interests until he died.
Until one fateful space skirmish with the forces of chaos, a drop-pod sent him careening through the warp, and soon after, into the Land of Equestria.
A world made up entirely of xenos, most of whom were small, fluffy, and colorful!
Lug likes it here already.
[Inspired by Warrior Tier's 'Ogryn Story' video.]
https://www.youtube.com/watch?v=5oNpb0dLNhE