Now that Valar is pinned down by the five named death knights, the Ghoul Asura could not unleash his full might in the war between two undead factions. Although the side of the Undead King is winning in a sense due to the buff that Valar gave all his allies once he stepped onto the battlefield. The Doom Knight that is once a great hero had to personally enter the battlefield to even the odds.
[The Doom Knight Mateo has entered the battlefield. All the allies of the doom knight will get a 20% increase in damage and a 50% chance to score additional damage from a critical hit when hitting a weak spot.]
The increase in attack power of the undead in the Arch Lich' faction might not be equal to what Valar gave when he went into combat but the 5% chance to get a critical hit more than made up for it. Normal players could only describe this as a lucky hit but it is a godsend for professional players.