From Spoiler TV

Supernatural - Episode 14.08 - Byzantium
Supernatural - Episode 14.09 - The Spear
Supernatural - Episode 14.10 - Nihilism
Supernatural - Episode 14.11 - Damaged Goods

Interesting titles. I guess it is spoilers time.

Nihilism (/ˈnaɪ(h)ɪlɪzəm, ˈniː-/; from Latin nihil, meaning 'nothing') is the philosophical viewpoint that suggests the denial or lack of belief towards the reputedly meaningful aspects of life. Most commonly, nihilism is presented in the form of existential nihilism, which argues that life is without objective meaning, purpose, or intrinsic value.[1] Moral nihilists assert that there is no inherent morality, and that accepted moral values are abstractly contrived. Nihilism may also take epistemological, ontological, or metaphysical forms, meaning respectively that, in some aspect, knowledge is not possible, or reality does not actually exist.

The term is sometimes used in association with anomie to explain the general mood of despair at a perceived pointlessness of existence that one may develop upon realising there are no necessary norms, rules, or laws.

Nihilism has also been described as conspicuous in or constitutive of certain historical periods: for example, Jean Baudrillard and others have called postmodernity a nihilistic epoch; and some religious theologians and figures of religious authority have asserted that postmodernity and many aspects of modernity represent a rejection of theism, and that such rejection of theistic doctrine entails nihilism.

- Sounds like Michael is still present?

nihilism from Urban dictionary!

A philosophy based on extreme skepticism. In it's most basic form (Before it was clouded by ideas involving politics, social rhetoric, sex, drugs, rock and roll etc.), which we can refer to as "epistemological nihilism", simply denies the possibility of knowledge of truth. Previous epistemological philosophies failed in obtaining truth because all possible vessels for obtaining truth cannot be proven truthful themselves. Empiricism fails because one must assume that their senses depict an accurate portrayal of their secular existence (or that a secular world even exists, for that matter), which fuels their observations; sensations also depend on senses to provide the observer with the source of the sensation. Rationalism fails because without a secular experience, real or imaginary, one's lack of experience prevents them from being able to reason. ie, they cannot reason without the use of empirical devices. Therefore, rationalism cannot gain one knowledge without empirical methods, which are already based on assumptions (faith) of senses; assumptions cannot lead to the knowledge of truth. Intuitionalism fails because it also has the potential to utilize empirical (and rational) devices; It allows one to alter their truth based on new experiences. This leaves room for "error" and keeps "truth" from being absolute or even certain.
Empiricist: Can't you see the truth?
Person: No, I'm blind.

Rationalist: I think, therefore I am.
Person: You used speech to make that proclamation; One must use sight or hearing to interpret.

Nihilist: Nothing can be certain.
Person: You can't prove that.
Nihilist: You're catching on.

Nihilism is the only epistemological philosophy worth following.
#nihil#nothing#nietzsche#existentialism#epistemological

Jim Michaels @TheJimMichaels 2 hours ago
We are tech scouting again here at @cw_son #Supernatural #spnfamily with @amandatapping at the helm of episode 10! This marks our halfway mark of the season!
.

Amanda Tapping @amandatapping 3 hours ago
Casting today for @cw_spn I love actors!! Auditioning is hard. And they are all so brave. Huge respect. Grateful to be on this side of the camera! #directingisfun
.

Google

Supernatural 14x10 Promo "Nihilism" (HD)

Synopsis for episode 10 - Midseason premiere from Ksite TV!

THE BATTLE AT HITOMI PLAZA CONTINUES – Michael has re-taken control of Dean (Jensen Ackles) as his army of monsters continues to move in on our heroes. Sam (Jared Padalecki) devises a plan to try and reach Dean and stop Michael before anyone else has to die. The episode was directed by Amanda Tapping and written by Steve Yockey (#1410). Original Airdate 1/17/2019.

Nihilism promo photos from KsiteTV!
.

CP24 Breakfast @CP24Breakfast 16 minutes ago
Returning for Season 14 of @cw_spn as Billie is actress @_LisaBerry! #Supernatural resumes Thursday on Space!
.

TouchwoodPR @TouchwoodPR 8 minutes ago
Did you catch the fabulous @_LisaBerry on @CP24Breakfast this morning? Tune into #Supernatural on @SpaceChannel Thursday night for a new episode featuring Death herself!
.

Supernatural s14e10 Extended Promo "Nihilism"

Supernatural Season 14 Episode 10 Review & After Show

Sarah Barra ? @Hellredsky Jan 17
"A good loop dream" #Supernatural #WeeklySPN #season14 14x10 @cw_spn @SuperWiki
.

Lisa Berry @_LisaBerry 22 hours ago
Thanks for the warm welcome back #spnfamily I love you all!
And now the question of the day! What's in the BOOK Dean @JensenAckles? Last night's episode was epic!!! @amandatapping & @SleepyPanda76 ????well done!
.

Rob Hayter @robhayter 21 hours ago
Super fun working with one of my heroes, #director ⁦@amandatapping⁩ #supernatural #spnfamily ✊respect.

Rob Hayter @robhayter 16 hours ago
Replying to @indubitablydubs @yvrshoots @amandatapping
?thanks. Gotta give props to @JensenAckles. Two different fighting styles and two different characters. Dude has chops.
.

Alicia @DirtroadFirefly 23 hours ago
All the added touches on the set of "Rockys bar" showing insights to Dean's mind, with a few touches of @JensenAckles is one of the things that makes the relationship between the crew, cast, and fandom so great ❣#Supernatural #Nihilism #SPNFamiIy
.

Stef Ⓥ @arachnobite 23 hours ago
While taxidermy freaks me out for obvious reasons, this hat is my favorite thing I’ve ever made for the show. He looks stoked to have it ??. Ep. 1410 #RockysBar #supernatural
.

Rob Hayter @robhayter Jan 18
?thanks. Glad you liked it. We had fun. @JensenAckles @jarpad @mishacollins rocked it. Director @amandatapping is awesome. @kirkjaques with the choreo. #teamwork #supernatural.
.

So the one odd character from Rocky's Bar was the female real estate agent. Trying to get Dean to sign the papers to sell the bar was her her one main focus. She reminds me of Crowley in this way. "Get the Deal, Close the Deal, No Tricks or Cheating to get the Deal."
Also in general of a crossroads demon, since he had to deal with so many of them.

So I had a thought about the Book from Death, John Winchester, & John's Journal. Could they be linked somehow? If we see some "time travel" in an upcoming episode, this could help this happen.
"What if" by some strange arrangement, that the answer Dean's looking for will be found in the Journal.