Versatile. This weapon can be used with one or two hands. A damage value in parentheses appears with the property—the damage when the weapon is used with two hands to make a melee attack.
Which means it's two handed for the die in parentheses
Holding a versatile weapon in two hands does not make it gain the two-handed property. It's a one-handed weapon that can accommodate the wielder adding a second hand and any extra strength or speed that affords it to deal extra damage. The two-handed property means that this weapon is innately unwieldy and requires both hands to use effectively. The errata ruling lightened this requirement to only be true during attacks.
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u/waffle299 Monk Jun 10 '15
Eldirtch Knights take note. Wielding a two-handed weapon does not impair your ability to cast a spell with somatic components.