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Whenever another Spectre ally uses a Special ability, Sabine gains 1 stack of Force Connection, doubled if the ally is Ahsoka Tano, for the rest of battle, which can't be copied, dispelled, or prevented.
Whenever Sabine gains a stack of Force Connection from another Spectre ally, she gains an additional stack of Force Connection.
Can you parse these two clauses from her Unique 1, please? If eXra uses a special, does Sabine gain two stacks (1 because a Spectre used a special + 1 because she gained a stack of Force Connection from another Spectre ally)? If GLAT uses a special, does she gain three or four stacks from GLAT using a special (does she gain one then double then plus one or does she gain one plus one then doubled)?
Or does the second clause not affect the first clause and refers to specials on unreleased Spectre characters that grant Force Connection (since eXra doesn't have any)?
Remember, you are looking at FINAL text. More than likely, these two lines come from two completely separate tiers of the ability. First one sounds like the basic ability, and the second is part of the zeta.