[@Dark Cloud] you guys share one dungeon. There can be IC rivalries so long as things go smoothly OOC. Overall your characters are going to want to push the goals of the Dungeon along so you can expand, get better supplies, gears and power. It's fine if characters disagree and there are power struggles - you are monsters after all - but generally speaking it's unwise to go undermine your fellow Dungeon Lords's goals.

For one the world of the Light is not friendly towards monsters.