The Bloodstone Rebellion - Thomas K. Carpenter - Bog

A Tournament of Champions has brought the realms' greatest warriors to the city of sorcery. The prizes include ultra-rare faez crystals which could turn an average combatant into an exemplar of physical prowess.

For Pandora, the tournament is a chance to get close to her grandfather and end his hold on the Undercity. Disguised as the Lady Saha, a minor noble from the maetrie realm, she joins the tournament with her bodyservant, Kuma. They must defeat countless warriors in an ever-changing arena while formulating a plan that can take down Dominion Thule. Their task takes on new urgency when they learn Dominion came to the Undercity, not just for the faez crystals and control over the clans, but for ancient artifacts that threaten the safety of the realms. If Pandora can't stop her grandfather, then more than Undercity will fall under Dominion's control.