Legendary Resistance (3/day). If Cassius Deathflame, Chosen of Flavius fails a saving throw, it can choose to succeed instead.
Undead Fortitude. If damage reduces Cassius Deathflame, Chosen of Flavius to 0 hit points, it can make a Constitution saving throw with a DC of 5 + the damage taken unless the damage is radiant or from a critical hit. On a success, it drops to 1 hit point instead.
Indomitable (3/day). Cassius Deathflame, Chosen of Flavius can reroll a failed saving throw. It must use the new roll.
Aura of Dread. Creatures hostile to Cassius Deathflame, Chosen of Flavius within 30 feet have disadvantage on saving throws against being frightened, charmed, or paralyzed.
Spellcasting. Cassius Deathflame, Chosen of Flavius is a 19th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 24, +16 to hit with spell attacks). It has the following spells prepared:
Cantrips (at will): Chill Touch, Eldritch Blast, Thaumaturgy
1st level (4 slots): Shield, Hellish Rebuke, Command
2nd level (3 slots): Mirror Image, Misty Step, Hold Person
3rd level (3 slots): Counterspell, Dispel Magic, Fireball
4th level (3 slots): Blight, Banishment
5th level (3 slots): Destructive Wave, Wall of Force
6th level (2 slots): Circle of Death, Sunbeam
7th level (2 slots): Finger of Death, Teleport
8th level (1 slot): Power Word Stun
9th level (1 slot): Power Word Kill
Martial Mastery. Cassius Deathflame, Chosen of Flavius has mastered combat, gaining the following benefits:
Multiattack. Cassius Deathflame, Chosen of Flavius makes three attacks: one with its greatsword and two with its shield bash or hellfire strikes.
Hellfire Greatsword. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 28 (4d6+9) slashing damage plus 22 (4d10) necrotic damage.
Shield Bash. Melee Weapon Attack: +18 to hit, reach 5 ft., one target. Hit: 18 (3d6+9) bludgeoning damage, and the target must succeed on a DC 24 Strength saving throw or be knocked prone.
Hellfire Strike. Melee or Ranged Weapon Attack: +18 to hit, reach 10 ft. (melee) or range 60 ft. (ranged), one target. Hit: 24 (4d6+9) force damage, and the target must succeed on a DC 24 Constitution saving throw or take an additional 18 (4d8) necrotic damage.
Frightful Command (Recharge 5-6). Cassius Deathflame, Chosen of Flavius can issue a terrifying command in a 60-foot radius. Each creature of Cassius Deathflame, Chosen of Flavius' choice within the area must succeed on a DC 24 Wisdom saving throw or be frightened for 1 minute. While frightened in this way, a creature must use its action to Dash away from Cassius Deathflame, Chosen of Flavius. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Necrotic Wave (Recharge 6). Cassius Deathflame, Chosen of Flavius can release a devastating wave of necrotic energy in a 60-foot radius centered on itself. Each creature in that area must make a DC 24 Constitution saving throw, taking 90 (20d8) necrotic damage on a failed save, or half as much damage on a successful one. Undead creatures within the area regain hit points equal to half the damage dealt.
Legendary Actions (3/turn). Cassius Deathflame, Chosen of Flavius can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. Cassius Deathflame, Chosen of Flavius regains spent legendary actions at the start of its turn.
Move. Cassius Deathflame, Chosen of Flavius moves up to half its speed without provoking opportunity attacks.
Hellfire Blast (Costs 2 Actions). Cassius Deathflame, Chosen of Flavius makes a Hellfire Strike attack.
Grim Harvest (Costs 3 Actions). Cassius Deathflame, Chosen of Flavius targets one creature within 60 feet that has been reduced to 0 hit points within the last minute. That creature must succeed on a DC 24 Constitution saving throw or be permanently disintegrated into ash. Cassius Deathflame, Chosen of Flavius regains 50 hit points if the creature fails the save.
Lair and Lair Actions
Cassius Deathflame, Chosen of Flavius' Lair
Cassius shares a lair with both its master Flavius, the All-Knowing, and its counterpart, Rezmidrox, the Ceaseless Death.
Cassius Deathflame is the right hand of Flavius. His herald, his champion, his distinguished chosen warrior to lead the legions of undead under Flavius' control. There are many servants that can be found throughout the dungeon preaching his achievements as the first death knight in service to Flavius, the All-Knowing.
Lair Actions
On initiative count 20 (losing initiative ties), Cassius Deathflame, Chosen of Flavius can take a lair action to cause one of the following effects; Cassius Deathflame, Chosen of Flavius can't use the same effect two rounds in a row:
Darkness Reigns. Magical darkness spreads in a 60-foot radius centered on a point within 120 feet. Non-undead creatures in the area must succeed on a DC 24 Wisdom saving throw or be blinded until they leave the darkness. The darkness lasts for 1 minute or until Cassius Deathflame, Chosen of Flavius dismisses it.
Rise of the Dead. Cassius Deathflame, Chosen of Flavius summons 1d4 wights or 1d6 shadows in unoccupied spaces within 60 feet. These undead serve Cassius Deathflame, Chosen of Flavius and act immediately after its turn.
Horrid Ground. The ground within 60 feet of Cassius Deathflame, Chosen of Flavius becomes black and viscous. All creatures of Cassius Deathflame, Chosen of Flavius' choice in the area must make a DC 24 Dexterity saving throw or be restrained as the ground pulls them down. The restrained creatures can repeat the saving throw at the end of each of their turns, freeing themselves on a success.
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