Vauldy is a 19th-level spell 1/3rd caster. His spellcasting ability is Intelligence (spell save DC 18, +10 to hit with spell attacks). It has the following Eldritch Knight (Wizard) spells prepared:

1st level (4 slots): k

2nd level (3 slots): k

3rd level (3 slots): k

4th level (1 slots): k

Traits

Enrage and Mythic Trait: Channeling Darkness

Channel Darkness. When Vauldy is reduced to half his hit points (121 HP), is reduced to 0 hit points or receives damage that reduces him below those hit point marks, Vauldy does not fall unconscious or die. Instead Vauldy regains 1 hit point, gains 125 temporary hit points and takes on his enraged and mythic state. This form can be assumed twice before Vauldy, requiring a long rest to use this form again. While Vauldy has these temporary hit points he gains access to the following Enrage abilities and Mythic Actions: