Level 1
Frigid Winds : The range of
Frost Nova is increased by 30% and the stun duration is increased by 0.5 seconds.
Boon of Undeath :
Quest: Every time
Dark Ritual recovers your health or mana, you gain a stack of Boon of Undeath.
Reward: For every 10 stacks you gain 1 armor, up to 10 armor at 100 stacks. Upon reaching 100 stacks, Kel'Thuzad gains an additional 10% maximum health.
Ray of Enfeeblement :
Quest: Use
Cripple on enemy heroes to gain 1 stack of Enfeeblement.
Reward: Upon reaching 25 stacks,
Cripple lasts 1 additional second and the mana cost is reduced from 40 to 25.
Level 4
Virulent Plague :
Plague can now spread up to 6 times for each casting.
Black Death :
Plague inflicts an additional 15% damage.
Enhanced Necromancy :
Quest: Use
Raise Dead to summon skeleton knights.
Reward: Upon summoning 15 skeleton knights, the amount of bones required to summon is reduced from 10 to 6.
Level 7
Unholy Ritual :
Dark Ritual now recovers 2% of Kel'Thuzad's maximum mana or health when the appropriate minion dies.
Frozen Death :
Frost Nova now inflicts an additional 40% damage on targets afflicted with
Plague.
Revulsion : When an enemy affected by the
Plague dies, nearby enemies are sickened and have their movement speed reduced by 15% for 1.5 seconds.
Frozen Armor : Activate to increase your spell armor by 30 for 10 seconds, reducing the damage you take from spells and abilities by 30%. Cooldown: 60 seconds.
Level 10
Death and Decay
Release the Scourge
Level 13
Epidemic :
Plague now has an increased chance to spread to nearby enemies, from a 30% to 50% chance.
Cracked Defenses :
Frost Nova reduces target's physical armor by 15 for 2 seconds, causing them to take 15% more damage.
Siphon : Activate to deal damage equal to 15% of the target's maximum health. Kel'Thuzad instantly recovers health equal to the amount of damage dealt. Cooldown: 60 seconds.
Skeletal Mastery : Skeleton knights summoned by
Raise Dead gain 15% more health and last 2 additional seconds.
Level 16
Erosion :
Plague inflicts an additional 10% damage to structures and fortifications.
Exhaustion :
Cripple reduces the target's attack speed and damage by an additional 10%.
Ritual Sacrifice : Each time an enemy minion dies near Kel'Thuzad, gain 1 stack of Sacrifice. Upon reaching 10 stacks, Kel'Thuzad's next non-heroic ability costs no mana.
Level 20
Inevitable :
Death and Decay inflicts an additional 15% damage. Kel'Thuzad now gains 30 physical armor and is unstoppable while he is channeling.
Undead Horde :
Release the Scourge causes 1 additional zombie to rise, and all zombies now move and attack 15% faster.
Lich's Phylactery : Activate to create an indestructible phylactery at your feet. Upon taking damage that would otherwise slay him, Kel'Thuzad instantly teleports to his phylactery with 1 health and removes all negative effects currently affecting him. This effect has a 120 second cooldown.
Power in Death : Every time Kel'Thuzad heals by
Dark Ritual, the cooldown of his non-heroic abilities is reduced by 0.5 seconds.
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