Spellguard

Superior Magic Resistance. The spellguard has Advantage on saving throws against spells and other magical effects. Spell attack rolls have Disadvantage against the spellguard.

Multiattack. The spellguard makes two attacks, using Force Flail or Javelin in any combination.

Force Flail. Melee Attack Roll: +7, reach 5 ft. Hit:8 (1d8 + 4) Bludgeoning damage plus 7 (2d6) Force damage.

Javelin. Melee or Ranged Attack Roll: +7, reach 5 ft. or range 30/120 ft. Hit:14 (3d6 + 4) Piercing damage.

Defensive Divination. Trigger: A creature the spellguard can see hits an ally within 5 feet of the spellguard with an attack roll, or an ally within 5 feet of the spellguard fails a saving throw against a spell or other magical effect. Response: The spellguard rolls 1d20 and chooses whether to use that roll in place of the d20 rolled for the attack roll or saving throw.