One of the three Demon Gods. Bergfrid considers himself to be the king of the monsters. A giant, ruthless dragon who wields mighty power. He's cocky, but he also knows his place under the command of Geist Wraith. Adding your own voice filter is not necessary, only the raw takes are needed.

Also for the lines:

Desaro Dios is pronounced like = Desahro- dee-os. Don’t linger on any of the sounds and pronounce it all in kinda like, one speed.

Here's a video that showcases the characters voice in Japanese to give you an idea on what you can aim for. Don't feel like you need to imitate anything, just do what you think makes sense for the character: https://youtu.be/7fbv9fGQy5c