I recently decrypted Telesto from an engram, and it only took about 10 motes of light to fully upgrade it. This is quite unlike every other exotic weapon and armor I have received. They have taken >10 motes of light to even unlock 1 additional perk.
(EDIT: Apparently I'm an idiot and had armor that benefitted fusion rifles, disregard.)
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Armor takes a lot but pop a telemetry and exotics and legendary weapons level up like crazy. My sleeper simulants took 5 motes each.
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Fabian strategy is even worse. It basically has no exotic perk.
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Yea you got armor that increases upgrade rate. I didnt and my telesto took 22 motes
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Items (legendaries) should take 19 notes of light to fully upgrade I believe?
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All my exotics pretty much max out in 10-15 motes tops. Usually just ten. But then again I stack telemetries. Like special telem with sniper telem of upgrading sniper rifle. Goes super quick.
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You probably had a class item where it increases the upgrade rate of fusion rifles.