I used a single 3oC yesterday during the bond brothers strike and was rewarded with 2 exotic engrams after the first bond brother was killed - got the telesto and hawkmoon 
Safe to say they work better than average for me, still use 1 3oC and drop 1 exotics each time I complete a strike
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	Do you use yours at the beginning of each strike or just before the boss?
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	I use it at the start of the ultra fight before anyone causes damage
 
										 
					 
		    