Does 3oC have a maximum stacking number? How many times can you stack it before you just either can't use them or they don't work?
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So here's how I believe it works: What they mean by "stacking" is not that you have a better chance of getting an exotic engram when you use more than one at a time, but rather that each failed attempt gives a slight boost to the chance of getting an exotic with the next ToC. Correct me if I'm wrong tho.