Homebrew
The Guard Caster is a 3rd level Wizard with the War Magic subclass. Their spellcasting ability is Intelligence (+6 to spell attacks, spell save DC 14).
The Guard Caster has 4 1st level and 2 2nd level spell slots.
Tactical Wit. The Guard Caster can add their Intelligence modifier to their initiative rolls.
Arcane Deflection. When the Guard Caster is hit by an attack or fails a saving throw, they can use their reaction to gain a +2 bonus to their AC against that attack or a +4 bonus to that saving throw. When they use this ability, the Guard Caster can't cast spells other than cantrips until the end of their next turn.
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