Subterranean dreams

The dreams had come in the early hours of dawn, stealing in and filling my subconsciousness with fresh tales. The story this time was strangely about the design of a game where the protagonist venturing as a slave-miner within in a dim, subterranean world, had discovered a violent calling or as that of a gladiator who had embarked on a quest of vengeance and blood.

This was the only fragment that I had remembered.