This wasn't supposed to happen.
In a burrowing frenzy through some soft stone, the scent of some delicious detritus wafted through the ground. Rockbreaker happened across a small series of tunnels, barely tight enough to fit his enormous frame that lent on to a small chamber. There lay some magma, absolutely out of place; absolutely to his liking.
Only moments after he entered the chamber the room began to fill with short bald men who appeared to step right from the stone itself. Quickly, Rockbreaker tried to fix his gaze on as many of them as possible but their small size seemed to inhibit their ability to look in all of his eyes at once and the attack was wasted.
The little people did not waste theirs. Many bolts were loosed, some hit and pain began to wrack through his midriff. Their speed was what truly amazed the umbering hulk. Rockbreaker had tried, perhaps too anxiously, to crush three of the little buggers in his huge mandibles. But, with surprising acrobatics, all affected an easy escape, leaving behind many glossy little stones. And that was all he remembered.
Bound, gagged, one eye covered with a patch, Rockbreaker found himself stuffed into a tiny passage looking back into the original chamber. The surprisingly high noted titters from the little men had broken his stupor, but this too stopped. Through the centre of the floor burst dread itself; a xorn, obviously in kahoots with the little men, used all three of its powerful arms to pull itself from the huge hole it had just created; while the gapping maw continued to munch on the stone the xorn moved with great speed to be towering over the bound Rockbreaker and glared with one of its immense eyes.
'We need your strength', (was it telepathy?) it intoned. 'Your reward will be great. Our queen needs to eat of a special stone lest she die. We know such a stone is near here. You will help.' The last was not a question and Rockbreaker knew enough to not mention this.