An Invitation Special Card is obtained by using an Invitation Coupon, which can be obtained by the player whose referral code is used by a new player. The player can only get cards with the lowest rarity (R), and would have to evolve it to raise their stats and rarity up to (SSR). These cards can be evolved 20 times, compared to the usual 3 times regular cards can be evolved. Also, these cards cannot be auctioned off in the market with the exception of Asteria.
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