I've been using Well of Radiance in Crucible, trying to get the medal for it, and I just wasn't feeling Lunafaction Boots. So I was like, okay what other exotic might I want to use? I was looking through them and then I looked over Sanguine Alchemy. It says rifts grant enhanced radar and mark enemies, and I was like, might be good to help go for the medal since it should work in a Well of Radiance like Lunafaction Boots since they both say rift in their wording. It doesn't work like that though. So if Lunafacation Boots work with Well of Radiance why doesn't Sanguine Alchemy?
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Because Bungie forgot about them. Luna's didn't really work with Well at first either but because people complained they fixed it.