I Was the Final Boss

Baphomet the boss of the Tower of Abyss
waits for a strong hunter who is able to fight on equal grounds against him
When he had grown bored of the repetitive battles he began to gain interest in the world of humanity due to the trophies he had obtained from the dead hunters
At the same time he became further entranced by the existence of humans when the strong hunter he had always wished for appeared before him
Ultimately Baphomet tries to become a human himself