In its physical form, the Rimesoul Catalyst resembles a faceted gemstone of pure glacial ice, etched with intricate runic symbols that seem to shift and reform with each passing moment. Its mystical properties allow it to resonate with the spiritual energies that permeate the course, periodically manifesting spectral ice formations or symbolic patterns that can reveal hidden truths.

Though the Rimesoul Catalyst does not possess a will of its own, its presence and resonance with the terrain can subtly influence events, shaping the course's obstacles and challenges or guiding those attuned to its power toward revelations that may aid in unraveling the mystery of the ice phoenix.