So I have this mission to get a ton of void ability kills and I thought the passive from an insurmountable skullfort would help shorten the time of my titans melee attack but when I do land the last hit it consumes both charges and goes on cool down. I even thought that maybe I have to wait until the shield goes away but it was still on cool down.
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Make sure it isn't the one to specifically do the quest on the Dreadnaught. That caught me. It has the TTK logo for the quest icon. There is a version that can be done anywhere as well.