Naturally, the first thing people think about are Light creatures becoming Darkness. TT_TT Darkness isn't getting any love. It has to be corruption, eh? Alas, my dark friends will never be accepted.
well, obv it would have a counterpart which starts as darkness and can go either way for the upgrade too, just thought I'd go for the obvious first. It's not obvious in my mind, but in the mind of society and hollywood, blame them!
Given that each elements seems to have an opposite and a partner, there could be some interesting upgrade options imo!
Also, a side note - I've gotten a warning that the developers aren't exactly too happy about the fact I am trying to introduce new mechanics, most notably the Duality Series. I will still design the series, since I already have ideas, but don't expect me to submit them for the crucible yet - at least not until Duality gets more support for being in the game.
you giving them headaches?
One vital question though: 6 cards in deck for unup. How many of upgraded though? 6 of each option or 6 total? (my feel is 6 total, otherwise it basically is completely 2 separate cards, loosing the unified start factor)