Carthin

The Runebreaker

In life, Carthin was a mage who forsook all arcana, except that which might be used to strike down the archmagi who betrayed him. He offers his binders a rebuke of magic, along with his unsettling eyes.

Legend

Carthin descended into the lair of Vortirrackt, the dimensional monster, alongside a band of a hundred other warriors. It was a deathtrap. The creature was as ferocious as it was cunning, and it had converted its accommodations—the tower of the arcane university—into an insidious dungeon. One by one, Carthin’s comrades fell to the tower’s perilous traps, bloodthirsty summoned monsters, and occasionally to Vortirrackt itself.
At last, Carthin and his remaining allies uncovered the artifacts they required and did the deed: expanding the dimensional rift from which the creature originated, until it swallowed Vortirrackt and the whole of the tower with it. Only Carthin emerged  before the tower was destroyed.
From Vortirrackt in the dungeon, Carthin learned that he and his allies had been sent on a suicide mission; none were meant to survive. All of the death within the university was the fault of the reckless archmagi and their experiments; it would stand no longer.
Taking up the mantle of “Runebreaker,” Carthin swore off all magic, save that which might kill the archmagi, and embarked on a journey of vengeance. The Runebreaker left a trail of mage corpses in his wake as he hunted down the former headmasters of the university. Some histories paint this as a folk tale about the common man standing up to authority, others remember it as a horror story. In the end, his vestige cares only that he continues his endless inquisition, evidenced by his unflinching red stare that unravels magic itself.

Flaw

While bound to this vestige, you gain the following flaw: “I believe that those who wield magic are innately corrupted, and I will trust nothing they say or do."

Blade of the Inquisition

You can cast the magic weapon spell at will as a 4th-level spell, without expending a spell slot. Your concentration on the spell is broken if the weapon ever leaves your hand.

Spellcasting: Mage-Killer

While bound to Carthin, you can cast the following spells, without expending a spell slot or material components: 3/day each: counterspell, dispel magic 1/day each: antimagic field, true seeing Casting antimagic field in this way doesn’t disable any of your vestige features, except for spellcasting and magic items. You regain all expended uses of these spells when you finish a long rest.

Trait: Dead Magic Eyes

While bound to Carthin, your eyes become vacant pits with two bright coals burning within them, granting you vision that can pierce arcana. You are always under the effects of the detect magic spell, which doesn’t require your concentration. Additionally, you can use your action to focus on a creature you can see within 30 feet of you. You can determine if that creature has cast a spell within the last 24 hours, and the spell’s school of magic, if any.