you were Artoria Pendragon no no no you weren't her Artoria Pendragon you were Holy Grail Mud that had corrupted her so she becomes saber alter after a while marrying Chaos until two people came to ask you shirou e Xuanzang Sanzang he managed to remove corruption from Artoria body You came out of her body not as mud but as the form and body of her appearance when you were about to run away suddenly the ground glow forming a light in a lotus flower shape

hours later wakes up inside Xuanzang Sanzang stomach

Xuanzang Sanzang: "it will just take time to purify Artoria! THAT'S IT, RELEASE ALL THAT NEGATIVE ENERGY! LET MY POSITIVE ENERGY CHANGE YOU FOR THE BETTER, Artoria-SAN! or should I say Mud Evil! BURP!~"