You can carry an additional Fusion Grenade. Does this stack with the "carry an additional grenade" perk?
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The heart of the Praxic fire doesnt give you the extra grenade, you are talking about the Starfire Protocol chest piece. It gives you the extra fusion grenade. It doesnt stack with the gift of the sun perk on warlock. You can have 2 fusion grenades from the armour perk and use some other perk on that warlock skill tree.. You will not have 3 grenades