Warframe PS4 - Lost Despair :(

I finally got the Stalker to drop something other than Blind Justice. I've been wanting the Despair and Dread for awhile. I debated leaving after wave 5, but didn't want to be a jerk... and then this happens. SHAREfactory™ https://store.playstation.com/#!/en-us/tid=CUSA00572_00