There are stages to jobs Alonso found out while he kept reading. it would seem that humans who have jobs and monsters can evolve other to improve and increase their abilities.

But the way human evolve is different from monsters 1st of all, humans only their jobs can to evolve and not their DNA nor do their appearance change for example a samurai after a killing a monster beast or even another human will naturally absorb the mana from the living that they killinto their birth mark at the back if the neck forcing their birth mark to expand in size.

The more mana they absorb the bigger the birth marks gets. after a certain point the birth mark revers back to its normal size but in a red colour not black.

This is called a job evolution or advancement the abilities of the person will increase as well as the life force, strength, eye sight and many more.

there are 3 stages to human job evolution and that is immediate job evolution , average job evolutionand Superior job evolution.

there is also a legendary 4th evolution that is almost impossible to obtain only 10 people in history have been record to have obtained the 4th evolution which is known as god hood.

That is right the 4th evolution is demi god in this from youstop to be human and control unimaginable power that you can only dream about you also gain immortality.

But for monsters it is more like a Pokemon evolution. For example a lonely weak goblin if he kills a lot of creatures or gets lucky and kills a high mana creature he can evolve to a hobgoblin from there he can move up to goblin king then goblin lord , if he lucky he even evolve to monsters outside his DNA like vampire or even a dragon it is possible it just depends on the amount of mana the monster absorbs at the time.

But the final evolution of monsters are usually demon lord or demon king they are on par with demi gods when it comes to power.

On rare occasions this might not be the case that the final evolution has to be a demon lord or king.

the human evolution path has only 4 steps while the monster evolutionary path can have 1 step to reach the top or 50 steps to get here. one should mention that it is almost impossible for a low ranking monster to evolve to demon lord within 1 evolution unless the monster got extremely,extremely lucky.

Also human evolution takes much much longer than the monster evolution so they both have their pros and cons. humans have less stages but takes longer while monsters have more stages but its quicker for them.

Alonso breaths a sign of relief after he has finished reading all the books. he feels a lot more calmer now that he understands the world a little bit now. he could not help but think that this world was made by and RPG game developer people even had classes he laughed in his head.

Even all this talk about absorbing mana when you kill that is basically exp ha ha ha Alonso laughed to himself. But at the same time he starts to plot his next motive.

Alonsos plan was simple he wanted to get back to his old way of life, when he was on earth. he wanted to get his lab back and become the custodian of knowledge to be the pinnacle of perfection.1st he will need resources and allies for him to build his old lab back and for resources he will money.

So Alonso stands up puts the books back in the shelves and leaves to go to the adventures guild to register and make some money.

Alonso arrives at the adventures guild it was a big building with 2 floors and looks just like a pub , both upstairs and downstairs was filled with round tables and chairs there are many men eating drinking and merry making.

Majority of the guys where very brawn some had scars on their face while some on their arms or legs. But one thing that was clear is that everyone had some sort of weapon on their backs or hips.

Alonso walks into the adventures guild through a double door. the very noisy building became very quite Alonso thought to himself that he could here a pin drop if one was to drop right now that is how quite the place is.

Alonso walked towards the bar where they served drinks he looked around at all the people eyeing him to his surprise they was a lot of non humans in there building in fact i would say that its about even.

50% humans and 50% non humans it made sense to Alonso because if slavery was just abolished not to long ago.

Humanoid monsters will be looking for a job and they will have no choice to become adventures.