2 grenades is the max, I recommend choosing one of the other perks on the sunsinger class now that you don't have to use the 2 grenade perk anymore.
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Other perk is useless lol That body exo is médium good. Others way better
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Touch of flame works great with Starfire Protocol since Fusion Grenades don't naturally ignite enemies. Combine that with Viking Funeral and you now have high powered sticky grenades with a ton of burn damage.