Eden indeed needs to prepare for the Fourth Rank Ascension Ceremony.
Although he has only just recently ascended to the Third Rank, the Fourth Rank seems a long way off.
However, Eden believes that something appearing distant doesn't mean it's really so far from reach.
In less than half a year, a series of fortuitous encounters enabled him to ascend from the First to the Third Rank.
It feels as though there's an unseen force protecting and blessing him. Eden believes this is God's arrangement, as Veldor said that the Prophet valued him.
Judging by this speed, ascending to the Fourth Rank is not wishful thinking.
Of course, this is just one reason Eden plans to prepare in advance.
Another reason is that Fourth Rank ascension materials are precious and rare.
According to the records of the Nameless Book, among the five main materials, only the horn of the Rynolizard is common, while the remaining four materials are all rare.