There is no reason fire legacy engrams to be that expensive. Outside of normal pvp and older pve content they are useless anyway. At most they should be 15 strange coins. I love the concept and strange coins arent too hard to get but i never have enough to buy an emgram without sacrificing a weapon or just depleting my wallet. I just want to play around with the ice breaker or hard light in pvp.
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They are expensive because they unlock Year 2 Blueprint as well.