I like the concept of Tlaloc. It was an exotic that a Warlock used that saved their super for the resurrection build. Since they sat on their super for a long time the gun fit in nicely with that build.
I mainly use a Sunbreaker Titan and I don't use my super unless absolutely necessary because I use the sunfire furnace to recharge my thermite grenade as fast as possible. A gun powered by a full, unused super would be ideal for my build.
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There is an armor piece that has that effect. Recharges abilities faster when super is charged.