He appears to be wielding two Thunderfury weapons.
Abilities[]
Cleave — Inflicts 110% of weapon damage to an enemy and its nearest allies, affecting up to 3 targets.
Darkfury — Blasts your enemy with shadowy death, dealing 2 Shadow damage and then jumping to additional nearby enemies. Each jump reduces that victim's Shadow resistance by 5. Affects 5 targets.
Spellbreaker — Inflicts 100% weapon damage and leaves the target wounded, reducing the effectiveness of damage spells by 75% for 6 sec.
Ruul the Darkener
Cleave — Inflicts 110% of weapon damage to an enemy and its nearest allies, affecting up to 3 targets.
[Third Fragment of the Cipher of Damnation] for 
[25-30G4] The Cipher of Damnation - Borak's Charge.