Excal-heim
Magic Resistance. Mage Slayer has advantage on saving throws against spells and other magical effects.
Annoying. Mage hunter has advantage to hit any creature within 5ft that is concentrating on a spell. (their weapon drags towards the caster)
6th sense. Mage hunter has advantage to hit any creature within 5ft that has cast a spell on the past turn. (their eyes glow from cast till hit)
Drops Guardian Tower Shield and Chain Sword
Chain Sword. Melee Weapon Attack: +9 to hit, reach 5 ft, one target. Hit: 2d10+5 slashing damage / Versatile 2d12+5 slashing damage. Shield wall. As an action, deploy the shield. While deployed, the mage slayer gains three-quarters cover but the mage slayer's movement drops to 0. Force Shield wall. (recharge 2-3) As an action, expand a translucent light-blue wall of force from the sides of the shield giving full cover but the mage slayer's movement drops to 0.