Giving up a grenade for a grapple that goes on Cooldown seems like a hindrance instead of the fun it implies.
Either make the Grapple infinite or make the Cooldown very minimal. It was advertised that you would be swinging around Destiny with the Grapple and speed hitherto unseen.
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Grapple can’t be infinite because of an aspect the warlocks have, but I agree it’s cooldown is a bit too long