Sword God: The Rise of Lancelot

When a sudden Occurrence happened...
Planet Earth, In which was still on it's medieval era happened to collide and fuse with another strange world.
A world which Different kinds of Species Existed.
A massive Earthquake Occured after both worlds joint in one.
Humans who ruled Earth, Became the bottom of the Food Chain.
For there, The New Stronger species Ruled...
The Strong prey on the Weak...
That is how the New World works now...
But amidst on all the humans who were hiding in the shadows, One human stood at the Top.
A human which was titled as the Strongest Man, And was their Liberator.
The Human who ended their Suffering, The human who achieved alot of things through any difficulties.
His name, Arthur Lionhart.
After Arthur made an alliance with the Elves and dwarves, They fought countless battles against the Stronger species. In the End, They finally achieved victory.
...
After the Humans finally gained peace, Arthur LionHart, Who emerged as Humanity's New King, Got betrayed and Killed by his Former comrade.
...
Then after his sudden death, He eventually got transported in the future and became a ten year old boy who was named Lancelot Valentine.
But it wasn't just any ordinary boy, The Former King has now become a Slave.
....
Now, Arthur Lionhart as Lancelot Valentine Starts his New Journey on the New World.