Preparation.
"Phew!" Sebastian exclaimed exaggeratedly after finishing the Dictionary.
Just a few pages into the dictionary validated his reason for deciding to go through it first. The knowledge of this world that was just updated in his mind meant a lot, most especially the knowledge about the rare beasts.
Transmigrating into a pure water world, Sebastian already expected to meet some pretty messed up species but this still blew his mind.
Perhaps, due to his constant encounters with Blue Tang fishes and snakes, he already rationalized every beast in Oceania to be mutated versions of beasts from earth but this rare list corrected his perception of beasts.
Of course, he appreciated the information that was revealed about the well-known beasts but the information on the rare beasts hit more.