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Telesto is pretty cool, it's a lot like the needler from Halo. Its not my favorite for an exotic, but it rips void shields apart, and the detonation can take out groups of enemies pretty quickly. I've seen people try to use it in pvp, but it never seemed very effective. I did use it a lot on the final part of the No Time to Explain quest line, it was incredibly helpful against the minataurs you fight there.