I just ran through the entire vault, and opened every chest we could. I got ascendants from every single one, except for the titan mark and chatterwhite. No guns, no gear. Nothing.
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I agree, it's ridiculous that you get ascendent materials from beating the bosses. I'm with getting them in chests but when I get them for slamming my head against the wall for an hour trying to beat a boss but my team sucks... You know something is wrong there