"I wouldn't miss your birthday for the world." Unbeknownst to her, Phloria was the only one truly happy for the invite.
If not for the enchanted sword, Lith wouldn't care for his own birthday, let alone inviting people to a party he was the first to be happy to avoid.
He had yet to find a way to salvage his relationship with Solus. Between that and Death Vision still haunting him, Lith wanted to be left alone with his family. Not to mention that having guests was a problem for him.
Despite all the renovations it had undergone, Lith's home was too small for hosting a decent birthday party, even by Earth standards. Rena and Trion had already moved out. Whenever he was at Lutia, Lith spent most of the time outside, doing the gods knew what.
Raaz and Elina had no reason to further expand the house, it would only make the maintenance more expensive. It had never been a problem before since Lith had no friends to invite aside from Selia.