Whats a weapon you’d bring from a different game and how would you tune it to Destiny standards(PvP or PvE)

CEL-3 Cauterizer for me from Advanced Warfare. Solar Exotic Shotgun. Slow firing, hard hitting with a large magazine that gets progressively more powerful as the trigger is held. Causes Solar shields to ignite and returns ammo on ignition defeats. Catalyst: Fast Hands. Grants Quickdraw, increases Handling and Reload when dealing sustained damage. It was always a straightforward gun. EDIT: missed opportunity to include Overflow