The Holy Grail War: I Was Summoned as a Servant, but I’m a Cultivator

What? The Holy Grail War! After transmigrating to a cultivation world, I get transported to the Holy Grail War as a Servant? And why is one of my opponents a Berserker from the Continent of Arad?

Let's see if I can fight my way through the Holy Grail War or lie low until the end.