Magic Resistance. Cassius has advantage on saving throws against spells and other magical effects.
Spellcasting. Cassius is an 20th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 17, to hit with spell attacks). Cassius can cast Fireball and Invisibility at will and has the following wizard spells prepared:
Cantrips (at will): Fire Bolt, Light, Control Flames, Prestidigitation, Create Bonfire
1st level (6 slots): Detect magic, Identify, Burning Hands, Magic Missile, Witch Bolt.
2nd level (5 slots): Continual Flame, mirror image, Flaming Sphere, Pyrotechnics, Scorching Ray,
3rd level (5 slots): Bestow Curse, Dispel Magic, Fly, Glyph of Warding, Haste, Intellect Fortress, Lightning Bolt, Sending, Slow, Vampiric Touch.
4th level (4 slots): Banishment, Dimension Door, Fire Shield, Wall of Fire.
5th level (4 slots): cone of cold, Geas, Immolation, Scrying, wall of force.
6th level (3 slot): Circle of Death, Disintegrate, Investiture of Flame.
7th level (2 slot): Delayed Blast Fireball, Finger of Death, Power Word Pain, Teleport.
8th level (1 slot): Feeblemind, Incendiary Cloud.
9th level (1 slot): Power Word Kill, Wish.
Dagger. Melee or Ranged Weapon Attack: +6 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.
Cassius can use his bonus action to cast the following spells: Dragon's Breath, Misty Step.
Cassius can use his reaction to cast the following spells: Counterspell, Feather Fall, Shield, Soul Cage.
Cassius has a total of 4 Legendary Actions for each round of combat.
Volcanic Terrain: Using all 4 legendary actions, Cassius can permanently transform 10 segments of the surrounding terrain, measuring 10 feet radius each, into hot lava. These points must be chosen from a chosen spot that Cassius can see within 1000 feet of his current position. These segments of terrain are permanently transformed into molten rock. Without a natural heat source, these segments of heated molten rock will immediately begin to cool at a natural rate. However, this cooling process takes a good while given the extreme heat at which they start.
Fed by Fire: Using 2 legendary actions, Cassius can choose at any time to use the flames from a spell he has cast to restore health to himself. When he does this, he gains half the amount of damage dealt by his spell as healing for himself.
Cast a spell: Using 1 Legendary Action, Cassius can cast a spell.
Description
Ancient Student of Magic: Cassius is an ancient wizard. His centuries of study have given him the ability to concentrate on 2 spells at one time.
Phoenix Rising: When Cassius is reduced to 0 hit points, as he falls unconscious his innate affinity with fire will immediately cause a blast of fire to explode outward from him causing 10d10 fire damage to each creature within 20 feet of his body. Each affected creature must roll a DC 18 Dexterity Saving Throw. On a successful save, the damage is halved. As this explosion happens, Cassius is lifted to his feet wreathed in flame and is restored to consciousness at 1 hit point. After this happens, he cannot benefit from this ability for 7 days.
Form of the Phoenix: Once per long rest, Cassius can choose to enter his Phenix Form, using a bonus action to do so. This form remains active for 1 minute, until he uses a bonus action to end it, or he is reduced to zero hit points. While this form is active, Cassius is covered head to toe in flames, his eye glow like molten lava, and he sheds bright light for 20 feet, dim light for an additional 20 feet. Additionally, Cassius gains a flight speed of 40 feet and a bonus of 5 to his AC while in his Phoenix form and all fire damage he causes gains a bonus of 5 points of damage. Finally, any melee attack that hits him while in this form causes 1d4+4 damage to the attacker.
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