Look at my Titan's primary. Insane gun.
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Well since no other pulse rifle melts me in PvP as fast as Nirwen's Mercy, I guess Nirwen's Mercy is the [u]most powerful[/u]. There was another legendary pulse rifle that melted me fast too, but I forgot its name (it wasn't Hawksaw or Lyudmila). The best IMO is Red Death, simply because I do better with it in PvP than with other pulse rifles. Bad Juju comes second IMO.