Cattusa

Keen Hearing and Smell. Cattusa has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Spellcasting. Cattusa is a 18th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 21, +10 to hit with spell attacks). The [monster name] has following spells prepared:
Cantrips (at will): Fire bolt, Guidance, True strike, Sacred flame
1st level (4 slots): Identify, Speak with animals (Cats), Burning hands, Detect magic

2nd level (3 slots): Locate object, See invisibility, Augury

3rd level (3 slots): Clairvoyance, Fireball, Tongues

4th level (3 slots): Divination, Locate creature, Fire shield

5th level (3 slots): Flame strike, Scrying, Mass cure wounds

6th level (1 slot): Find the path

7th level (1 slot): Delayed blast fireball

8th level (1 slot): Sunburst

9th level (1 slot): Foresight

Multiattack. Cattusa makes two claw attacks and Staff of Cattusa bite attack

Claw. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 41 (7d10 + 6) slashing damage plus 4 (7d10 + 6) psychic damage. 

Staff of Cattusa. Melee Weapon Attack: +12 to hit, reach 100 ft., one target. Hit: 83 (14d10 + 13) bludgeoning damage plus 83 (14d10 + 13) psychic damage. 

After another creature takes an action, Cattusa can take a legendary action. Cattusa can take a 3 legendary actions per day.

True strike. Cattusa casts the True Strike cantrip.

Claw (Costs 2 Actions). Cattusa takes the claw action.