The naga is a 5th-level spellcaster (spell save DC 12, +4 to hit with spell attacks) that needs only verbal components to cast its spells. Its spellcasting ability is Intelligence, and it has the following wizard spells prepared:
Cantrips
mage hand
minor illusion
ray of frost
Level 1 (4 slots)
charm person
sleep
Level 2 (3 slots)
detect thoughts
hold person
Level 3 (2 slots)
lightning bolt