Questions

Lex had heard the term 'Primordial' before. In fact, let alone a corpse, he had even met a living Primordial, technically. The Lotus on his back was actually called a World Seed Lotus, and its species was called the Primordial Origin Lotus series.

Lex did not know much about this species, but based on the name he could easily guess that the lotus on his back was just one of many Primordial Lotus'. Moreover, the lotus required extremely special spiritual energy called Primordial Spirit energy which would be present in the Inn unless he raised the star level of the Inn to 8!

That was the original reason why he had to carry the lotus on his back, as it could only absorb that energy from the universe at large outside the Inn. He did not know how abundant that energy was in the universe, but at least it surpassed what was present in the Inn.