Hey I recently created a new character and beat the story with it and I've got nightfalls and what not unlocked but still no gambit.
Just to clarify I'm one of the free players (Blizz gave the game out as a gift) and I haven't bought forsaken so Idk if there's a limit or something, all I know is that the other day I was having fun playing gambit with my hunter and than after making a warlock I cant use gambit on either character.
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Gambit is a Forsaken DLC activity, though it was made available to all players during the Solstice event. As that event ended at the weekly reset on Tuesday, you would no longer have access to Gambit without purchasing Forsaken.