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He thought of asking Creaky Bones for some insight or perhaps consulting with the Cunning God.
The cards mentioned above were the more potentially powerful A-level cards in Ree Shil's original dragon card deck.
Cards like the Bell Dragon and the Crystal Dragon Queen do have S-level versions.
The S-level version of the Bell Dragon is the Elf Dragon God.
It basically doesn't retain the original mechanism but becomes a more direct Wind-chasing healing card, carrying the skill to [Resurrect] dragon cards.
The S-level version of the Crystal Dragon Queen is the Spirit Calling Dragon.
Similarly, the original mechanism was removed, transforming from a Determination card that primarily focused on survival and secondary summoning, to a purely summoning-focused Berserker card.
From the significant changes to the card faces, one can tell that these two cards need to go through many steps before they can become S-level.