Why does Dean kill this character in end of Season 10?
In the last episode of Supernatural Season 10, Dean summons Death to kill him, so that he will not be turned into Demon due to Mark. However, Death tells him that he cannot kill Dean with Mark as it will free the 'Darkness'. However, he can send Dean far away and Dean needs to kill Sam, so that Sam will not try to bring him back.
However, he changes his mind at last moment and kills Death instead of Sam. But why kill Death, he can simply leave Sam.
Best Answer
At this point Dean has essentially 3 choices:
Do as Death asks, kill Sam and go "away"
Take Death up on his first offer - to give the Mark to someone else and then have Death remove it from himself.
Kill Death and figure it all out later.
Number 1 is out since he can't bring himself to kill Sam (and he knows that if he doesn't do it Death will in order to prevent Sam trying to "rescue" Dean), Number 2 is out since he knows what the battle to control it is like and doesn't want to put that on someone else who will likely kill innocents and quite probably get himself and or Sam killed trying to stop them. He can't just call the whole thing off since Death will still kill Sam to prevent him attempting to remove the mark (and release the darkness)
Even if I remove Dean from the playing field, we're still left with you. Loyal, dogged Sam, who I suspect will never rest until he sets his brother free, will never rest until his brother is free of the Mark, which simply cannot happen lest the Darkness be set free.
That leaves Door number 3 (the "figure it all out later" part becomes sort-of moot since unbeknownst to Dean Rowena/Crowley/Castiel are in the process of removing the Mark) but it's in keeping with Dean's character which is that killing things is his default plan, and of course his devotion to Sam above all else.
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Why did Death let Dean kill him?
Realizing he can't fight the Mark of Cain anymore, Dean summoned Death to kill him so he won't be a threat to mankind anymore, giving him Mexican food Dean had made himself as an offering.Why does Dean kill Sam?
Death explains the history of the Mark and how it binds the Darkness and needs to be on someone to keep it bound. He offers to send Dean somewhere so far away he won't be a threat anymore. However, he demands Dean kill Sam as the price so Sam won't be able to get him back.What happened to Dean in season 10?
Demon Dean Supernatural season 10 began with Dean's disappearance with Crowley after season 9 closed with his resurrection as a demon. After gallivanting with the King of Hell for a time, the relationship became strained. Meanwhile, Sam refused to give up looking for his brother.What happens at the end of season 10 Supernatural?
Supernatural ends its tenth season by wrapping up the Mark of Cain narrative. As Dean succumbs more and more to the Mark's power, Sam gets increasingly desperate to track his brother down and set Rowena on performing the spell that will get rid of the First Curse.Supernatural Sad Moment. \
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Answer 2
Dean killing Death was an accident, which is why he looks so shocked. He meant to decapitate his brother, but missed and accidentally hit Death who unwisely happened to be standing in the path of the scythe. The scythe looks pretty heavy and Dean's probably never handled one before, so it makes sense that his swing would be off. It looks like his depth perception might have been inaccurate, which also makes sense since he was very emotional at the time and wouldn't have thought to check again.
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Images: Tim Gouw, cottonbro, Charles Parker, Charles Parker