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It wasn't what I had expected at all… When I touched the Rainbow Star, I ended falling back to my Spiritual Realm, meaning that the power of the Star was fused into my Spirit Orb.
But it didn't end in just that, as my Astral Projection Body ended merging with the star when I touched it, crystalizing itself while my mind was still inside.
I believe the Rainbow Star, the remnants of this power, intended to create a new and unique Spirit, perhaps the Star itself was the infant stage of the new Spirit itself.
However, when I touched it, the Spirit immediately assimilated my Astral Projection, crystalizing it and turning that into my new Spirit.
My Astral Projection merged with the Rainbow Star, as I'll call this crystal-like and star-shaped Spirit born from the leftover power of Mammon's soul and became a Spirit of its own.