This is a great idea! But it needs to be refined.

First off, in the base area needs to make you invulnerable so as to not disturb the Triple Triad matches. Entering it when an enemy is present will make dramatic music play and the sky darken as you're forced into a Triple Triad Duel with an opponent. The winner gets to live, the loser is sucked into a void portal and dies horrifyingly. The base automatically is yours when there are no more people to challenge your dueling skills left in the area.