Corrupted Tasi

Spellcasting. Corrupted Tasi is a 20th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 21, +17 to hit with spell attacks). Corrupted Tasi has the following sorcerer spells prepared:

Cantrips (at will): chill touch, fire bolt, shocking grasp, shape water, frostbite, thunderclap, control flames

1st level (4 slots): catapult, shield, mage armor, magic missle

2nd level (3 slots): scorching ray, enlarge/reduce

3rd level (3 slots): fireball, melf's minute meteors, counterspell

4th level (3 slots): wall of fire, sickening radiance

5th level (3 slots): animate objects, immolation, dominate person

6th level (2 slot): chain lightning, disintigrate

7th level (2 slot): firestorm, teleport, crown of stars

8th level (1 slot): incendiary cloud, earthquake

9th level (1 slot): meteor swarm, Balefire

Staff of the Magi. While holding the staff, you can use an action to expend some of its charges to cast one of the following spells from it, using your spell save DC and spellcasting ability: conjure elemental (7 charges), dispel magic (3 charges), fireball (7th-level version, 7 charges), flaming sphere (2 charges), ice storm (4 charges), invisibility (2 charges), knock (2 charges), lightning bolt (7th-level version, 7 charges), passwall (5 charges), plane shift (7 charges), telekinesis (5 charges), wall of fire (4 charges), or web (2 charges).

You can also use an action to cast one of the following spells from the staff without using any charges: arcane lock, detect magic, enlarge/reduce, light, mage hand, or protection from evil and good.

Wild Magic Surge. Once per turn, the DM can have you roll a d20 immediately after you cast a sorcerer spell of 1st level or higher. If you roll a 1, roll on the Wild Magic Surge table to create a magical effect.

Tides of Chaos. Once per long rest, you can gain advantage on one attack roll, ability check, or saving throw.  Must roll on the wild magic surge table before you regain use of this feature.

Font of Magic. Corrupted Tasi has 20 sorcery points that she regains when she finishes a long rest.  She can use her sorcery points to gain additional spell slots or sacrifice spell slots to gain additional sorcery points as a bonus action.

Quickened spell. When Corrupted Tasi casts a spell that has a casting time of 1 action, she can spend 2 sorcery points to change the casting time to 1 bonus action.

Empowered Spell. When Corrupted Tasi rolls damage for a spell, she can spend 1 sorcery point to reroll up to 7 of the dice.  She must use the new rolls and you can use this option even if you've used another Metamagic option. 

Heightened Spell. When Corrupted Tasi casts a spell that forces a creature to make a saving throw, she can spend 3 sorcery points to give one target of the spell disadvantage on its first saving throw made against the spell.

Twinned Spell. You can spend sorcery points equal to a spell's level (1 for a cantrip) to target a second creature in range with the same spell, as long as the spell at the level it's being cast is incapable of targeting more than one creature.

Controlled Chaos. Whenever Corrupted Tasi  rolls on the wild magic surge table, she can roll twice and use either number.

Spell Bombardment.  Once per turn, when Corrupted Tasi rolls damage for a spell and rolls the highest number possible on any of the dice, choose one of those dice, roll it again and add that roll to the damage.

Flames of Chaos.  As a bonus action Corrupted Tasi can call upon the flames of the Elemental Chaos to envelope her body as if she were under the effects of the Investiture of Flame spell.

Fire Master.  Corrupted Tasi ignores resistance to fire damage, and treats any creature immune to fire damage, as if it only had resistance. 

War Caster.  Corrupted Tasi has advantage on CON saving throws that she makes to maintain her concentration on a spell when she takes damage.  She can perform somatic components on spells even when she has a weapon or shield in one or both of her hands.  She can use her reaction to make an attack of opportunity with a spell that has a casting time of 1 action, and only targets that creature. 

Fey Step. Corrupted Tasi can magically teleport to an unoccupied space within 30 feet of her.  Each creature within 5ft. of her take 7 fire damage.

Staff. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 5) bludgeoning damage, or 8 (1d8 + 5) when used with two hands.

Spell Absorption. While holding the staff, you have advantage on saving throws against spells. In addition, you can use your reaction when another creature casts a spell that targets only you. If you do, the staff absorbs the magic of the spell, canceling its effect and gaining a number of charges equal to the absorbed spell's level. However, if doing so brings the staff's total number of charges above 50, the staff explodes as if you activated its retributive strike.

Corrupted Tasi can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Corrupted Tasi regains spent legendary actions at the start of its turn.

Fey step. Corrupted Tasi cause her fey step ability.

Cast spell.  Corrupted Tasi can cast a spell of 3rd level or lower, using 1 legendary action per spell level.

Incite Chaos. (3 Actions) Corrupted Tasi invokes the will of chaos onto herself and each creature within 60ft. of her.  Each creature must roll on the wild magic surge table as the unstable magic in the area takes hold.