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That's the fundamental difference between humans and monsters. With that said, Icarus is a pretty unique case, as not only does he have the trace possessed by monsters and his physique increases with every level he goes up. As also, being an ex-human who has kept all his rationality, Icarus still has the capacity of equip items, equipment and use elixirs. Of course, to do this, he first needs to find such items
In any case, over the past few days, Icarus has been exploring and carefully observing the changes his body has been undergoing. To do this, he's been hunting and leveling like crazy, and surprisingly he's already managed to reach level 19, being just one-step away from level up to the next level