Pretty much every umbral engram I’ve ever had I’ve decrypted then deleted what I’ve got from it. I haven’t unlocked whatever the -blam!- all the slots are though. Anyway, it costs me 5 legendary shards to decrypt and I get 4 back when I delete. That’s a ripoff in itself. I get flooded with worthless damn embral engrams. Not only that but I have to go to the “H.E.L.M” to decrypt them (which is a place in the tower, but inaccessible from the tower). I have a lot of complaints, sure, but it sure feels like Bungie half-asses the shit out this game.