Legendary Resistance (3/Day). If the lich fails a saving throw, it can choose to succeed instead.

Rejuvenation. If it has a phylactery, a destroyed lich gains a new body in 1d10 days, regaining all its hit points and becoming active again. The new body appears within 5 feet of the phylactery.

Spellcasting. The Weather Pug is an 18th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 20, +12 to hit with spell attacks). The Weather Pug has the following spells:

(at will): create or destroy water, control water, shape water, wall of water, call lightning, lightning bolt, fireball, fire bolt, fire shield, prestidigitation

3/Day: storm of vengeance, control weather

Cast. The Weather Pug casts a spell on its spell list.