Hello.
I am / was having the same trouble, have had my phone for a week on Verizon. I would go to bed around 11:30pm, set alarm on phone and the battery was at 99%. I would wake up in the AM about 7 - 730 and it would be in the mid 60s. I always had the bump thingy and XBOX conncet off and the wifi set to be off when in lock screen After deleting certain apps like whatsapp, I never had skype I found that it never made a difference. Even battery saver mode on didn't seem to matter.
What I found after much reading and just about to take back a phone that wouldn't make it past 3pm was an article about LTE.
Why LTE sucks (your battery, that is) — Tech News and Analysis
It seems that the way LTE works uses allot of battery doing its thing. Some phones give you the options in setting to just use 3G but I don't believe you can on Verizon, at least with the 8X. Last night going to bed I turned off the data, if you still have WiFi this isn't a problem, and had the saver mode on, may as well as who need all the updates when you are dreaming. Charge again was full and when I woke up it was at 94%. Big difference. I have not turned data on yet and have reinstalled whats app and used a few times. 4 hours later battery is at 82%.
You can still call, make and receive texts with no LTE on.The only downside to this whole thing is that when not on WiFi you could keep LTE off and just turn it on when you want to check stuff. I agree we should have to go through this but it is the world we live in when a phone is no longer just for making calls.