All the way, the Death Knight class is an issue of concern. More and more players pay more attention to it. However, the Death Knight Blood tree represents the Death Knight's focus on his/her ability to use the blood of his enemy and himself in combat. The Death Knight uses this ability to draw strength for combat, provide buffs and healing to party members and inflict massive amounts of pain and suffering on their foes. In addition to their considerable power granted from this talent tree, Blood specced Death Knights can also take on a presence of Blood, providing increased damage and additional healing benefits when attacking.
   See the following content about blood talent:
   Butchery: Whenever you kill an enemy that grants experience or honor, you generate up to 10 runic power. In addition, you generate 1 runic power per 5 seconds while in combat.
Whenever you kill an enemy that grants experience or honor, you generate up to 20 runic power. In addition, you generate 2 runic power per 5 seconds while in combat.
   Subversion: Increases the critical strike chance of Blood Strike, Heart Strike and Obliterate by 3%, and reduces threat generated while in Blood or Unholy Presence by 8%.
Increases the critical strike chance of Blood Strike, Heart Strike and Obliterate by 6%, and reduces threat generated while in Blood or Unholy Presence by 16%.
Increases the critical strike chance of Blood Strike, Heart Strike and Obliterate by 9%, and reduces threat generated while in Blood or Unholy Presence by 25%.
Blade Barrior: Whenever your Blood Runes are on cooldown, your Parry chance increases by 2% for the next 10 seconds.
Whenever your Blood Runes are on cooldown, your Parry chance increases by 4% for the next 10 seconds.
Whenever your Blood Runes are on cooldown, your Parry chance increases by 6% for the next 10 seconds.
Whenever your Blood Runes are on cooldown, your Parry chance increases by 8% for the next 10 seconds. Whenever your Blood Runes are on cooldown, your Parry chance increases by 10% for the next 10 seconds.
Blade Armor: Increases your attack power by 1 for every 180 armor value you have.
Increases your attack power by 2 for every 180 armor value you have.
Increases your attack power by 3 for every 180 armor value you have.
Increases your attack power by 4 for every 180 armor value you have.
Increases your attack power by 5 for every 180 armor value you have.
Scent of Blood: You have a 15% chance after being struck by a ranged or melee hit to gain the Scent of Blood effect, causing your next melee hit to generate 5 runic power. This effect cannot occur more often than once every 20 seconds.
You have a 15% chance after being struck by a ranged or melee hit to gain the Scent of Blood effect, causing your next 2 melee hits to generate 5 runic power. This effect can not occur more often than once every 20 seconds.
You have a 15% chance after being struck by a ranged or melee hit to gain the Scent of Blood effect, causing your next 3 melee hits to generate 5 runic power. This effect cannot occur more often than once every 20 seconds.
Two-Handed Weapon Specialization 2 
Increases the damage you deal with two-handed melee weapons by 2%.
Increases the damage you deal with two-handed melee weapons by 4%.
Rune Tap 3 
Rank Converts 1 Blood Rune into 10% of your maximum health.
Dark Conviction 3 
Increases your chance to critically hit with weapons, spells and abilities by 1%.
Increases your chance to critically hit with weapons, spells and abilities by 2%.
Increases your chance to critically hit with weapons, spells and abilities by 3%.
Increases your chance to critically hit with weapons, spells and abilities by 5%.