Astral stones are a form of "Pseudo Currency". While they are used to purchase Astral Training attempts, they are not earned directly, but rather purchased from the Arena Shop and Ancient Arena Shop. You may purchase 20 Astral Stones for 500 Arena Tokens or Ancient Arena Tokens.

This has the side effect of making rewards for those Arenas worthwhile for those who have maxed out the star level for the Heroes whose Soulstones are available in each store.

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