Cult Leader

Spellcasting. The cult leader is a 15th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 17, +9 to hit with spell attacks). The cult leader has the following cleric spells prepared:

Cantrips (at will): light, sacred flame, thaumaturgy

1st level (4 slots): bane, guiding bolt inflict wounds, shield of faith

2nd level (3 slots): aid, hold person, spiritual weapon

3rd level (3 slots): animate dead, bestow curse,  dispel magic, spirit guardians

4th level (3 slots): banishment, death ward, freedom of movement

5th level (2 slots): flame strike, insect plague

6th level (1 slots): heal, word of recall

7th level (1 slots): fire storm

8th level (1 slots): earthquake 

Multiattack. The cult leader makes two weapon attacks.

Rapier. Melee  Weapon Attack: +8 to hit, reach 5 ft. one creature. Hit: 8 (1d8 + 3) piercing damage.

Dagger. Melee or Ranged Weapon Attack: +8 to hit, reach 5 ft. or range 20/60 ft., one creature. Hit: 6 (1d4 + 3) piercing damage.

The cult leader 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. The cult leader regains spent legendary actions at the start of its turn.

Cantrip: The cult leader casts a cantrip

Blaspheme: (Costs 2 Actions). The cult leader utters a blasphemous word. Each non-undead creature within 10 feet of the cult leader that can hear the magical utterance must succeed on a DC 15 Constitution saving throw or be stunned until the end of the cult leader's next turn.

Spell: (Costs 3 Actions).  The cult leader casts a spell from its list of prepared spells, expending a spell slot as normal.