the 4 skill slot mission states "get a 4 slot my merging two 3 slot cards", but I did it by merging ten 1-slot cards at once. chancesfor 1 card are listed at 1%, no listing for 10 cards. either I got really lucky, or the chances add. and you could probably just use your "add slot" vial on a 3 slot to get this mission also

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Are there elemental relationships in the game such as fire being weak to water, etc?