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This game provides one-time healing in dungeons in the form of these 'Light Shards'. You'll notice that they look like segments of the ring Arceus has around its body.
Arceus features in the plot of Reborn, and amazingly enough where seemingly every other fucking game fails at making Arceus interesting, Reborn succeeds. Arceus is never directly mentioned, but is heavily alluded and hinted to in some actually pretty interesting ways. At least, some. I might have forgotten how much I hated an evil cultist that comes up later as the typical HURR HURR EVIL ARTIST CULT type that I hate, and I don't know what goes on in the lastest episode.