ReadMe.txt : Instructions on which specific weapon the model replaces.
If this were an official crossover (similar to the NieR: Automata or Monster Hunter events), the narrative would likely follow these beats:
: A boss fight against a "Shadow" version of the player character, representing the darkness within their own heart, culminating in the unlocking of a new "Form Change" Ability. Installation & Usage (General Modding Context)
While the "rar" extension suggests a downloadable file—likely containing custom models, animations, or textures for a PC mod—the true "complete piece" lies in how these two universes converge within the game's engine. The Concept: Hearts and Crystals