Two awesome worlds, one story, want to combine

, since the 6th grade I've been mind journeying through a 5 part epic, with the main character in the first four parts being Māvalavan - a title which isn't really "king" and isn't really "knight," but means "people leader" or "Lord of the Warriors." The main character in the 5th part is the reincarnation of the fourth Māvalavan, but is called "Takshanan" meaning "land knower," or "thinghood knower" and is different from the other main characters because he becomes more powerful through learning the land or the true forms of things, as opposed to every other character who becomes more powerful through slaying foes or doing things. . . That's not the main point of my post here. The main point is that I've in essence created two different worlds to house the same story: one with great European influence, and one with great Hindu (I am Hindu) influence. I would like to combine these worlds but I don't know how. The Euro world is thusly: it has a lot of races, people such as: Imps (slightly short, grey skinned hawkish elf eared folks), Yetis, Tamnari (big, chunky people often referred to as the "potato race" since potatoes originate from their island) Bugbears (furry elf eared folks) Oyoni (people from Sentinel Island who worship dragons and are dark skinned) Dwarves (they're tiny, 3 foot tall, rotund people) Etc. There's various classes in the world that the player can be, such as: Dragoon (it's a dragon warrior class which always uses two handed weapons) Mystic Archer (someone who combines combative magic and archery) Commando (someone who does stealth/quick DPS combat) And others. The Himdu influenced world is thus: The races are all ethnicities, and while they generally don't have overtly different physiological or linguistic traits, they do all consider themselves to be different. There are actually different races (the Manusas (this has all the ethnicities), the Asuras (this has clans), and Ahuras (this is a tiny group of people who are all one family)). The classes are exactly the same, with some differences. The European world has knights, Jesters (a league of chaotic evil aholes who dress as court jesters), an evil archangel who is trying to get resurrected, and the world mythology is centered around the Cycle of Darkness, since the world lived through its happiest years in complete darkness and it predicts the return of the world to its natural state. The Māvalavan, and the Takshanan, are the focal poiny of these prophecies, because their actions are meant to bring the world back to the caring, caressing dark. The Hindu world doesn't have the same mythology, and it also doesn't have "knights" in the European sense but it does have feudalism (it was a thing here in Southern India too). It has an evil conqueror named Rojan Rojan who takes it upon himself to end the Harsha dynasty (which the 3rd Māvalavan was of) as well as conquering the whole of the continent. Māvalavan must defeat this guy before trying to fight any other, greater evil. It has Asuras of many kinds, such as the Kaitala (who have a hand on the top of their head that can do magic and also make a phallic symbol and attack in physical combat). MY question, how should I go about combining these two worlds