There could at least be exotic raises because in house of wolves they didn't rove old exotics from the game they let you ascend them and I don't think bungie will get rid of all the old exotics I think you will be able to ascend the exotic weapons because the article never said anything about exotics but I think you will have to get far in ttk to ascend exotics.
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Get rid of old legendary gear and don't let people ascend their favorites until they earn new ttk maxed weapons or replace etheric light with something new so you use new weaopons to get to use new and old
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Meant remove not rove