The pulse rifles exotic perk is interesting and it fits the lore but I feel like it would be useless as your never doing max damage to a shielded enemy and then perk has no function in pvp. On the other hand, explosive rounds on a pulse rifle sounds godly. Maybe let the element be a choice and it would be like the murmur where the stats would change as well. I'm really sorry if I sound negative. The other concepts are great but the skeleton key is great but angry in pve would ruin it so I think something else needs to be added to it. The rocket launcher sounds like a buffed version of the dragons breath. These are great ideas so don't let what I say get you down. I just believe they need work. [spoiler]i kind of skimmed so I may need to look again[/spoiler]