In an MMO, it is understood that players take notes and compare them. The economy of these games is partially based on information and the prize is largely social status based on reputation- there is an honor in being a member of the guild that achieved the first confirmed kill of a given boss.

(It is a feature (or a bug I suppose) that people in this world do not share information and instead hoard it jealously and we saw that in the form of the ordeal with the skill book.)

As to the question of the mechanics of this particular evolution, Elm is running into the problem that he is thinking about his particular situation from the perspective of someone playing a video game rather than being a person in a strange world that shares some mechanical similarities with a video game he is familiar with.

It’s for that reason that he cannot imagine why this boss could have been deliberately set up to be a trap since players in his video game never deliberately did that (this lack of trolling is somewhat implausible, but I digress).

But trolling is a huge feature of the world in which Elm and Ruche currently reside.

As to the specific purpose of this trolling, it is possible that it is intended like most information hoarding we has seen so far to be a type of gatekeeper behavior.