questionz

I sometimes encounter certain casual-speaking anime/manga characters add "-da ze" (da-ze) at the end of their sentences . I also prominently see Touhou's Marisa add "da-ze" at the end of her sentences. What does this "-da ze" indicate specifically and when is it used plus by who?

The Laevateinn weapon is apparently a collaboration weapon, or so I've read on the GE english wikia. SOmeone care to explain where it's collaborated from?