Getting room for himself wasn't only because Xue Ren wanted some room for himself and Di Xun. He also began describing essential runes to create a portal. As he has enough resources, mainly the skull from the lord, Xue Ren can already leave this world.
Of course, he himself doesn't want to. There are more nobles to kill and more importantly, Xue Ren wants to meet Maria. He knows that Endrun might be not the man who lived the long, but a lot of time has passed ever since his death.
That's why, there was also possibility of Maria being different. Even more, with Luxuria being here. However, from what he heard, she has secluded herself in her own castle, so the possibility of her living or sleeping for all this time was also huge.
If that's indeed truth, then the time has come to awaken the beauty.