Arno can be found in the Guildhall. When 
Roah Moonglow, 
Boss Friol, or 
Trinoda attempts to take over the Guildhall, Arno joins the fight alongside his Zhentarim allies against the Guild. Siding against the Zhentarim ends in Arno's demise, or in his disappearance if he is knocked out.
Arno can be summoned with 
Gather Your Allies variant 
Black Fist Enforcers, if the party completed 
Aid the Underduke and sided with the Zhentarim.
Cunning Action: Dash (
)
Range: Self 
Flourish () – 
Rapier +1
Bludgeoning
Feint an attack to possibly throw your opponent 
Off Balance.
DEX Save Range: Normal weapon range
Recharge: Short rest 
Main Hand Attack (
) – Rapier +1
PiercingMake a melee attack with your equipped weapon.
Melee: 1.5 m / 5 ft 
Piercing Strike () – Rapier +1
Piercing
Stab an enemy and possibly inflict 
Gaping Wounds.
Undead and Constructs can't receive Gaping Wounds.
CON Save Range: Normal weapon range Recharge: Short rest 
Sneak Attack (Melee) () – Rapier +1
Deal an extra 1d6 damage to a foe you have 
Advantage against.
Also works if you have an ally within 1.5 m / 5 ft of the target and you don't have 
Disadvantage.
Range: Normal weapon range Recharge: Per turn 
Weakening Strike () – Rapier +1
Weapon
Target an enemy's hands with a non-lethal attack and possibly inflict 
Weak Grip.
Creatures without weapons can't have Weak Grip.
STR Save Range: Normal weapon range Recharge: Short rest Ad placeholder
