The alchemist examination on Dan Island is not a test for novice alchemists.
Many warriors had already become alchemists before arriving at Dongzhou Academy, but because their alchemist status was not recognized at Dongzhou Academy, they needed to be re-examined there.
The second reason is to improve their rank.
Many alchemists from previous tests who received a rank of fourth or fifth grade might have advanced in their alchemy skills recently and thus wish to attain higher alchemist ranks.
This is the reason for the existence of Dan Island.
Alchemists who obtain recognized ranks on Dan Island can join two alchemist factions: one is the Academy Faction, and the other is the Tianbao Tower Faction.
These are the two alchemist factions Lin Bai had previously learned about.
From a bird's-eye view, Dan Island looks exactly like the terrain of an elixir furnace.
