You can go ahead & ascend them but they will not be effective enough in crucible events (after TTK) were level advantages are enabled (Iron Banner & Trails), but you can still have a blast in regular crucible (which won't need to be ascended).
[spoiler]This is the last IB event before TTK[/spoiler]
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Weak. Then again I'm a thorn scrub, so it's not like I care a whole lot. I really want to get felwinter though.
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It's good weapons man, collect them & keep them for regular crucible!...btw...nothing wrong with using Thorn either (use what works for you!)...