User blog comment:GoDai/GoDai's Translations: T.U.S., Exis, and Phantaminum (Pentaminum)/@comment-109.93.38.37-20150706012237

Actually ToG being a facility to generate Exis seems plausible. If SiU has stated that Phantaminium is the only one within the tower, that makes sense since no one climbed the tower. If you climb it all the way to the top, you get almost unlimited power-that is Exis. For those who manage to climb to the top, they can become one, or maybe even the perfect one, the true God of TuS.