Abjuration Resistant. The Abjuration Master is immune to any Abjuration Spell Effects it chooses to be immune to

Spellcasting. The Abjuration Master is a 20th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 24, +16 to hit with spell attacks). The Abjuration Master has following Abjuration spells prepared:
Cantrips (at will): Blade Ward, Resistance 
1st level (25 slots): Absorb Elements, Alarm, Armor of Agathys, Ceremony, Mage Armor, Protection from Evil and Good, Sanctuary, Shield, Shield of Faith, Snare

2nd level (13 slots): Aid, Arcane Lock, Lesser Restoration, Pass Without Trace, Protection form Poison, Warding Bond

3rd level (9 slots): Beacon of Hope, Counterspell, Dispel Magic, Glyph of Warding, Magic Circle, Nondetection, Protection form Energy, Remove Curse

4th level (8 slots): Aura of Life, Aura of Purity, Banishment, Death Ward, Freedom of Movement, Intellect Fortress, Mordenkainen's private sanctum, Private Sanctum, Stoneskin

5th level (7 slots): Antilife Shell, Banishing Smite, Circle of Power, Dispel Evil and Good, Greater Restoration, Planar Binding

6th level (6 slots): Druid Grove, Forbiddance, Globe of Invulnerability, Guards and Wards, Primordial Ward

7th level (5 slots): Symbol

8th level (4 slots): Antimagic Field, Holy Aura, Mind Blank

9th level (3 slots): Imprisonment, Invulnerability, Prismatic Wall

Shortsword. Melee Weapon Attack: +2 to hit, reach 5 ft., 1 target. Hit: 3 (1d6) Peircing damage.