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?

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I only like this one better because you can ACTUALLY GET AN SR OFF NORMAL GACHA. Like holy hell, that's probably the best thing to happen to these types of games that makes it worth grinding through the all the N class cards