Alustriel Silverhand

Special Equipment. Alustriel wear a Ring of Protection, a Ring of Mind Shielding. She wields a Staff of Silverymoon. Roll 1d10 to determine how many charges the staff has remaining.

Chosen of Mystra. Alustriel is immune to petrified condition and lightning damage. Also she can cast polymorph on herself at will and transform into a beast whose challenge rating is 1 or lower.

Spellcasting. Alustriel is a 19-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 19, +11 to hit with spell attacks). Alustriel has following wizard spells prepared:
Cantrips (at will): light, mage hand, fire bolt, friends, blade ward
1st level (at will): detect magic, magic missile, false life, disguise self
2nd level (at will): detect thoughts, earthbind, invisibility
3rd level (3 slots): counterspell, fly, sending, erupting earth
4th level (3 slots): greater invisibility, ice storm, Otiluke's resilient sphere
5th level (3 slots): cone of cold, dawn, geas
6th level (2 slots): disintegrate, mass suggestion
7th level (1 slot): crown of stars, prismatic spray
8th level (1 slot): maze, dominate monster
9th level (1 slot): wish

Multiattack. Alustriel makes two attacks with her silver hair and staff of silverymoon in any combination. She can cast one of her cantrips or 1st-level spells before or after making these attacks.

Staff of Silverymoon. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) bludgeoning damage or 6 (1d8+2) bludgeoning damage when used with two hands. 

Silver hair. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 7 (2d6) force damage, and the target must succeed on a DC 19 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. 

Silver Fire (Recharges after a Long Rest). Magical, heatless, silver fire harmlessly erupts from Alustriel. The silver fire surrounds her until she is incapacitated or until she uses an action to quench it. She gains one of the following benefits of her choice, which lasts until the silver fire ends: 

• She can breathe underwater.
• She can survive without food and water.
• She is immune to magic that would ascertain her thoughts, truthfulness, alignment, or creature type.
• She gains resistance to cold damage, and she is unharmed by temperatures as low as -50 degrees Fahrenheit.      

While the silver fire is present, she has the following additional action options:

• Cast the thuderwave spell 3rd-level. After Alustriel takes this action, roll a d6. On a roll of 1-2, the silver fire disappears
• Cast the healing word spell 3rd-level. The target regains 3d4+5 hit points. After Alustriel take this action, roll a d6. On a roll of 1, the silver fire disappears.
• Alustriel deals 36 (6d12) force damage to all objects that aren't being worn or carried in a 60-feet square. Each creature in the area must succeed on a DC 19 Dexterity saving throw, taking 36 (6d12) force damage on a failed save, or half as much damage on a successful one. If this damage reduces the targets to 0 hit points, it is disintegrated. After Alustriel takes this action, roll a d6. On a roll of 1-3, the silver fire disappears.