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Cairnax - The Hammer of Hell

Large undead, neutral evil

Undead Champion, Returned From Hell for Vengeance

Armor Class 23 (+3 Plate & Flying Shield)
Hit Points 400 (40d12+140)
Speed 40
STR
28
(+9)
DEX
10
(+0)
CON
24
(+7)
INT
16
(+3)
WIS
15
(+2)
CHA
19
(+4)
Saving Throws Str +14, Con +12, Wis +7, Chr +9
Skills Athletics +14, Perception +13, Intimidation, +10
Damage Resistances Bludgeoning, Slashing, Piercing, Acid, Cold, Fire, Lightning, Thunder
Damage Immunities Poison, Necrotic
Condition Immunities Charmed, Poisoned, Frightened
Senses Passive Perception 23
Languages Common, Draconic, Infernal, Abyssal
Challenge 20 (25,000 XP)

Spellcasting. The Cairnax - The Hammer of Hell is a 5-level spellcaster. Its spellcasting ability is Charisma (spell save DC 17, +15 to hit with spell attacks).

Cantrips (at will): Toll the Dead, Chill Touch

1st level (4 slots): Absorb Elements, Command, Dissonant Whispers, Wardaway

2nd level (3 slots): Blindness/Deafness, Darkness, Hold Person, Ray of Enfeeblement

3rd level (2 slots): Fear, Hunger of Hadar, Speak with Dead, Stinking Cloud, Vampiric Touch

Poisonous Presence. Any creature that starts its turn within 10 feet of Cairnax must succeed a DC 20 Constitution save or be Poisoned until the start of its next turn (This trait is tied to Cairnax's Armor of Pestilence)

Magic Resistance. Cairnax has advantage on saving throws against spells and other magical effects.

Legendary Resistance. If the Carinax fails a saving throw, it can choose to succeed instead (3/day).

Regeneration. Cairnax regains 10 hit points at the start of its turn. If Cairnax takes Radiant damage, or is within 5 feet of a holy symbol, this trait doesn't function on its next turn. Cairnax dies only if it starts its turn with 0 hit points and doesn't regenerate. (This ability is tied to his armor, the Armor of Pestilence)

True Sight. Cairnax has True Sight out to 40 feet. (This ability is tied to his helmet, the Visage of Terror)

Legendary Actions. Carinax can make 2 legendary actions per round of combat

Actions

Multiattack. Cairnax uses Frightful Prescence, then makes three attacks with Nightfall. He may replace two attacks with one of his spells from Spellcasting

Nightfall (Two-Handed Mace). Melee Weapon Attack +14 to hit reach 10ft, 23 (3d8+8) bludgeoning damage plus 14 (4d6) necrotic damage. The target must succeed a DC 15 Constitution Save or have the Blinded Condition until the end of their next turn. A target only be effected by this once per turn.

Frightful Prescence. Each creature of Cairnax's choice within 120 feet must succeed a DC 18 Wisdom save or be frightened for 1 minute. A frightened creature can repeat the save at the end of each of their turns. (This ability is tied to his helmet, The Visage of Terror)

The Wailing of The Hells (Recharge 5-6). Cairnax opens a rift to the Hells. Each creature within a 60 foot emanation must make a constitution saving throw (DC 18) on a fail taking 6d6 Psychic and 6d6 Cold damage and gain the Stunned Condition until the end of their next turn. On a success take only half damage. (This ability is tied to his cloak, The Shroud of Malice)

Reactions

Parry. Cairnax adds +5 to its AC against one melee attack that would hit it. To do so, Cairnax must see the attacker and be wielding a melee weapon.

Vampiric Retaliation. Cairnax Casts Vampiric touch as a reaction to a hostile creature leaving his range. When cast in this way, the target becomes grappled if the spell attack hits. The target can escape the grapple with a Strength (Athletics) or Dexterity (Acrobatics) check against the Grapple DC 17

Legendary Actions

Shroud of Darkness (1 Action). Cairnax Casts Darkness on himself. (This ability is tied to his cloak, the Shroud of Malice)

Pounce (1 Action). Cairnax moves up to half his movement speed and makes one attack with Nightfall.

Execute the Feeble (2 Actions). All Creatures within 120' of Cairnax who are frightened take 6d8 Psychic damage. If they are below half health this increases to 6d12