The penguins seem to be used for level fodder, but I also wonder about the Phantasmas. Those are the only cards you can "promote" to higher star levels, so I'm not sure what they actually do? Also, what do you need to promote them?
I wanted to go for Sez after the tier list, but while playing the chapter I kept wondering about Vildred. Like, I kinda saw the twist from a mile away, but I also kept thinking "shame he's probably not playable, that's the only bearable character of the bunch" and then I ended up pulling his 5* in my second selective summon.
When the book started glowing the librarian said something along the lines of "I think you'll form a special bond with this one!" Who am I to defy fate? ¯\_(ツ)_/¯ So there we go, I have a 5* evil person on my team now.
I'm thoroughly overwhelmed by the amount of resource types and upgrade options.
Like... is it even worth it slotting equipment in before you unlock all the chapters?