Melee only. It has a combi-bolter attached but references the rules on pg.65 for how it works, while the Talon has its own profile in Abaddon's entry on pg.57. Another example of someone having two weapons on each hand is Tyberos the Red Wake, who has Chainfist/Lightning Claw weapons where there are specific rules about how you attack but still does not offer bonuses to each other; each weapon has a separate profile.
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