I'm going to say this. Buy the Obsidian Mind and here's why. Exotic armor can be much more difficult to find than the weapons. Nightfalls and raids generally (more often than not) reward you with weapons. It's rare that you'll get armor from it, or even the class you want. And you never know if xur will ever sell obsidian mind again. I know Xur has only sold the helm of saint-14 like once and luckily I bought it when I did because I never ever get armor drops from nightfalls. So there's no other way.
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Myself i have gotten 3 armor parts and one weapon from the nightfall
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Except for all of the exotic helm engrams he sells...
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You have a 1 in 9 chance
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1 in 12 since the DLC is out
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[quote]Except for all of the exotic helm engrams he sells...[/quote] All? Lol are you serious? He has only had them a couple times. Even so, you have shitty chances of getting what you want. I bought nine helmet engrams in attempt to get obsidian mind to no avail.
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He use to sell them every week but when the expansion was released they nerfed it so he only sells it sometimes.
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Maybe if you try not to want it you'll get it...
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[quote]Maybe if you try not to want it you'll get it...[/quote] That's funny
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Lol it worked for me getting the black hammer, I tried 24 times specifically for that with no luck. Then the one time I really want the Hunter helm I get the black hammer.