Masterful Jack of All Trades Jack o' Trades

In world where there the land masses are five supercontinent size one. Of the five of them there are four that are considered home to the four major races that exist. Demon, Beast, Dragons, and Human are the four major races. Three of the four races all hyper specialized in one single area only.

Magic for Demons
Physical/Weapon based Combat for Beast
Defense for Dragons

The only race not to be hyper specialized in a single area would be humans. They are considered jack of all trades having stats that level in constant rate rather then in just a single area. However humans are considered the weakest race cause of this. The other three races make up for their hyper specialization in single area through two means. Having stronger base stats then humans and master level skill and knowledge in their chosen area being second nature to them.

However group made of all four races complete a task that their peoples have been being for generations upon generations. One that ends with the human being betrayed by the other members of his group. Left to die and betrayed by everyone they learn of the hidden past between four races after unlocking a human only ability somehow through chance. One that allows this jack of all trades to become a master of them all. Also armed with buried and hidden knowledge plans to get revenge on everyone that wrong him one by one.