Telesto is a great exotic fusion rifle. Here's a good round I had with it:
http://youtu.be/XuZIZ1CTWI8
I went Unbroken, which was nice. The other team wasn't so good but it was still cool. Please watch it if you would like.
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It's definitely exotic because of its look and cosmetics plus it does require skill to land all stickies.
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It's definitely not the best exotic fusion rifle... Plan C and Pocket Infinity blow it out of the water in pvp. That quick charge on Plan C, and the pocket infinity's ability to just melt through everyone way out classes telesto. Any of those kills you got with telesto in that video you could have gotten just as easily with either of the other two, or any legendary fusions for that matter, and you wouldn't have had to wait for the bolts to explode, it just would have instantly vaporized them.