The fall finale of season 4 of Arrow put a crazy spin on things and the teaser for the episode premiering the return of the show reveals that Oliver (Stephen Amell) is going to be on the war path against Damien Darhk (Neal McDonough).

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The teaser for the episode, titled 'Blood Debts,' shows a distraught Oliver as the fatally injured Felicity (Emily Bett Rickards) is fighting for her life in hospital.

"Now I know it's not my fault, it's my responsibility, to end it I am going to kill him," Oliver's voiceover is heard through the clip.

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It seems like Felicity is going to succumb to her wounds, as at the end of the clip Oliver is seen shedding tears over someone's fresh grave. Even though nothing is explicitly stated and we only have visuals to go by, the teaser very strongly hints at the fact that Felicity is six feet under and Oliver is set to take Darhk down.

Little else is known about the episode so far, but the rest of the season is being set up as quite the stormy conclusion for this chapter.

'Blood Debts' will air on January 20 on The CW.

Watch the teaser:

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Arrow, The cw, Television