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Gjallarhorn? Neither side - can kill both your enemy and you. Safety - self explanatory. By this right - first was used against Fallen (Lord of Wolves reference), or as people rule the recruitment board with them. Memories - was made from armor of heroes of Twilight Gap. Last one is also self explanatory. Hint 1 - again, death during Twilight Gap. Hint 2 - Gjallarhorn sold by Xur once, no one knew it was that good, so everyone passed.