Given the information, I'll assume you're looking for a script or dialogue text that could be related to a hero or a storyline involving "Unwavering Soul" in Mobile Legends. Since I don't have the specific details about what "Unwavering Soul" refers to in your query, I'll create a generic script that could fit a narrative or dialogue in the game.
A developer builds a mobile RPG where the protagonist is a knight whose soul cannot be corrupted. Using USSM: unwavering soul script mobile