from a titan main pvp point of veiw, if you have Armamentarium equipped you have 2 nades ready to go, and with aftershocks you can completely lock down chokepoints for a good while. As for the blast radius on Titan nades it's within a few feet 5-8 ft tops. But if yo azz gets caught within that range..may baby jezuz say a prayer for you.
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But can one grenade cover the entire rooftop?
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The lightning granade has a cone-like AOE which, if placed in the right spot, can cover most of a control point. In addition to what other people have said ill add that armamentarium has full DISC stat and you can easily max out with just another piece of armor. Having 2 lightning nades with 28sec CD (IIRC) can grant a good spam .
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I've been killed by grenades planted on point C while standing in the sniping spot for point A. That's at least a fifteen-foot radius. That cannot be legit.