Spellcasting. Kitiara Uth Matar is a spellcaster that can cast spells up to the level 6. Its spellcasting ability is Intelligence (spell save DC 16, +10 to hit with spell attacks). Kitiara Uth Matar can cast the following spells that were given to her by Tiamat : Breath Weapon, Cone of cold, Ice Storm, Investiture of ice, Armor Of Agathys.

Multiattack : Kitiara Uth Matar can make two attacks with her longsword as an action.

Greatsword +2 : Weapon Attack: + 13 to hit, reach 5 ft., one target. Hit: 2d8 + 10 slashing damage.

Breath Weapon : As an action, Kitiara Uth Matar can exhale destructive energy. When she uses her breath weapon, each creature in the area of the exhalation must make a Constitution saving throw. The DC for this saving throw equals 17. A creature takes 5d6 cold damage on a failed save, and half as much damage on a successful one. Distance : 15 ft. cone. Each turn, roll a d6. On a 5 or 6 Kitiara gains the ability to recast this spell.

Armor of Agathys (3/short rest) (1 hour) : As an action, a protective magical force surrounds Kitiara, manifesting as a spectral frost that covers her and her gear. She gains 30 temporary hit points for the duration. If a creature hits her with a melee attack while she has these hit points, the creature takes 20 cold damage.

Cone of cold (3/long rest) : As an action, a blast of cold air erupts from her hands. Each creature in a 60-foot cone must make a Constitution saving throw. A creature takes 9d8 cold damage on a failed save, or half as much damage on a successful one. A creature killed by this spell becomes a frozen statue until it thaws.

Ice storm (1/short rest) : As an action, a hail of rock-hard ice pounds to the ground in a 20-foot-radius, 40-foot-high cylinder centered on a point within 300 feet. Each creature in the cylinder must make a Dexterity saving throw. A creature takes 4d8 bludgeoning damage and 4d6 cold damage on a failed save, or half as much damage on a successful one. Hailstones turn the storm's area of effect into difficult terrain until the end of Kitiara's next turn. 

Investiture of ice (1/long rest) (concentration) : As an action and until the spell ends, ice rimes Kitiara's body, and she gains the following benefits:

• She is immune to cold damage and has resistance to fire damage.
• She can move across difficult terrain created by ice or snow without spending extra movement.
• The ground in a 10-foot radius around her is icy and is difficult terrain for creatures other than her. The radius moves with you.
• She can use her action to create a 15-foot cone of freezing wind extending from her outstretched hand in a direction she chooses. Each creature in the cone must make a Constitution saving throw. A creature takes 4d6 cold damage on a failed save, or half as much damage on a successful one. A creature that fails its save against this effect has its speed halved until the start of your next turn.

Legendary Resistance (2/Day) : If Kitiara Uth Matar fails a saving throw, she can choose to succeed instead.