The Legends of Tomorrow are at last behind us, but Arrow has at least one bit of Season 4 business unresolved: which of Oliver’s loved ones are in that future grave? We’ve ventured plenty of guesses, but the full trailer for 2015 finale “Dark Waters” may offer a breathless clue.

Take this with a grain of salt for now, but The CW may have had good reason not to premiere the “Dark Waters” trailer with this past week’s “Legends of Yesterday.” The full promo for the final Arrow of 2015 returns the focus to Oliver’s battle with Damien Darhk once more, but seemingly at the cost of Felicity, whom Damien throws into an airtight chamber to teach Oliver a lesson:

So reads the official synopsis for Arrow midseason finale “Dark Waters”:

OLIVER TAKES ON HIVE — After the city is attacked again, Oliver (Stephen Amell) makes a bold move against HIVE. Malcolm (John Barrowman) checks in on Thea (Willa Holland) and leaves her with a warning. Things take a horrible turn when Damien Darhk (guest star Neal McDonough) retaliates in a brutal manner at Oliver’s mayoral holiday party.

Granted, Felicity seems like too obvious of an answer, and Barry would likely have been more broken up by visiting the grave with Oliver in the premiere. Still, Arrow fans are on high alert, so check out the full trailer above, and stay tuned for the latest from Arrow Season 4.

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