The nullifier captain is a 13th level spellcaster, Its spellcasting ability is Intelligence (spell save DC 16, +8 to hit with spell attacks). The nullifer captain has the following wizard spells prepared:   Cantrips (at will): blade ward, dancing lights, mending, message, ray of frost
1st-level (4 slots): alarm*, mage armor*, magic missile, shield*
2nd-level (4 slots): arcane lock*. invisibility
3rd-level (4 slots): counterspell*, dispel magic*, fireball
4th-level (4 slots): banishment*, stoneskin*
5th-level (4 slots): cone of cold, wall of force
6th-level (4 slots): flesh to stone, globe of invulnerability*
7th-level (4 slots): symbol*, teleport
*Abjuration spell of 1st level or higher   Arcane Ward. The nullifer captain has a magical ward that has 30 hit points. Whenever the nullifer captain takes damage, the ward takes the damage instead. If the ward is reduced to 0 hit points, the captain takes any remaining damage. When the nullifier captain casts an abjuration spell of 1st level or higher, the ward regains a number of hit points equal to twice the level of the spell.