Thanks for answering. Spent my stones on 2 gold gachas and got a Dark Valkyrie (which, using LoV's logic, is probably best used as food for a Valkyrie) and a fire SR that is ridiculously strong so I guess it might be event related (Justice Priestess Anne - base ATK 2400).

About the freezes, I've got the maid they give when you begin that has 1.2x to all enemies and a wind valkyrie with 2x attack. I'll try to replace the wind one with another Valkyrie to see if it gets more playable.

One last thing, is there something special about those S.U.K. cards the event gives at 2000 points? They don't even show on the album which is really weird.

Sorry for asking a lot of stuff, the in-game info is rather lacking and Nutaku's FAQ doesn't help very much.