When you get a Plaguebearer’s Aetherwarped Cleaver of Voracity on your second Valbury run despite having no plans of ever making a physical build but a simple Puncturing Demapteran Slicer of Alacrity simply refuses to drop after hours of farming the Royal Hive. 
I spent 2 hours farming Sentinel yesterday to try and get those damn blueprints and they just won’t drop.
I find the “travel time” to get to him to be quite tedious. I can’t believe I survived 2 hours of repetitive runs. I’ll try it again in a week or 2. I can’t do that again any time soon
Pretty sure I’ve got one of these so neener-neener. 
EDIT: I do in fact have one, plus a Puncturing one of Fury and a Puncturing one of Spines. 
Yeah we really could use a rift inside the temple.
Do i have any option besides Cadence for a physical build?