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Keelan only has one actual "power". It's a passive thing - his presence alone nullifies most kinds of magic, with a range of approximately seventeen feet. The field centers at his heart and is spherical - magic won't reach anyone within from any angle.
The split between what he does and doesn't nullify is best defined as "inherent" versus "concentrated" (or passive versus active). For those familiar with Undertale, you can think of it like this: the magic that binds monsters together would be left entirely unaffected, but the magic they use for bullets and cooking wouldn't work. If a necromancer casts a spell that raises the dead, Keelan's presence would not negate the undead. He could stand near the necromancer and prevent them from raising more, however. If the necromancer must concentrate constantly to maintain the undead, however, it would be considered concentrated and thus he'd nullify it at either end. A magic potion could affect him, but a siren's song would not (aside from being incredibly pretty music). A psychic would be unable to read his mind, but if empathic, could pick up free-floating passive feelings and things like static. He cannot make a werewolf human again, but his presence could probably prevent the werewolf from shifting under the full moon - however, the werewolf would have to spend the entirety of the risk period within Keelan's null zone to keep from turning at all.
Rituals work on him by virtue of the magic being inherent to the ritual and ritual components. Weapons powered by science, such as laser guns, work on him. As for things that are technically scientific but practically magic, just default to the inherent/concentrated divide. Superman's laser vision is concentrated, his superstrength is inherent. Flight operates on the same principle: fly into his null zone, you'll either have an abrupt meeting with the ground or your momentum will carry you out of it, at which point you may continue flying. Exceptions are those who actually have wings capable of flight and those whose natural state of being is floating. If you require a magical item that responds to your will to use your ability (for example, Harry Potter's Firebolt), it will not function in his null zone.
Do you need to focus to turn it on or keep it on? It's concentrated.
Do you need to focus to turn it off, if turning it off is even possible? It's inherent.
Glamours tend to get dispelled in his presence, as well, though results on that front vary.
Keelan's null zone affects him, too, making him incapable of learning to use any kind of magic. His null zone falls under inherent. Not sure if it would prevent things like turning him into a vampire, should the conditions for turning him be met.
The nullification is in his blood. If it leaves his body, it still has nullification properties, though the radius of null is relative to the quantity of blood. It is more effective in a liquid state but still has some effect when dry.
The split between what he does and doesn't nullify is best defined as "inherent" versus "concentrated" (or passive versus active). For those familiar with Undertale, you can think of it like this: the magic that binds monsters together would be left entirely unaffected, but the magic they use for bullets and cooking wouldn't work. If a necromancer casts a spell that raises the dead, Keelan's presence would not negate the undead. He could stand near the necromancer and prevent them from raising more, however. If the necromancer must concentrate constantly to maintain the undead, however, it would be considered concentrated and thus he'd nullify it at either end. A magic potion could affect him, but a siren's song would not (aside from being incredibly pretty music). A psychic would be unable to read his mind, but if empathic, could pick up free-floating passive feelings and things like static. He cannot make a werewolf human again, but his presence could probably prevent the werewolf from shifting under the full moon - however, the werewolf would have to spend the entirety of the risk period within Keelan's null zone to keep from turning at all.
Rituals work on him by virtue of the magic being inherent to the ritual and ritual components. Weapons powered by science, such as laser guns, work on him. As for things that are technically scientific but practically magic, just default to the inherent/concentrated divide. Superman's laser vision is concentrated, his superstrength is inherent. Flight operates on the same principle: fly into his null zone, you'll either have an abrupt meeting with the ground or your momentum will carry you out of it, at which point you may continue flying. Exceptions are those who actually have wings capable of flight and those whose natural state of being is floating. If you require a magical item that responds to your will to use your ability (for example, Harry Potter's Firebolt), it will not function in his null zone.
Do you need to focus to turn it on or keep it on? It's concentrated.
Do you need to focus to turn it off, if turning it off is even possible? It's inherent.
Glamours tend to get dispelled in his presence, as well, though results on that front vary.
Keelan's null zone affects him, too, making him incapable of learning to use any kind of magic. His null zone falls under inherent. Not sure if it would prevent things like turning him into a vampire, should the conditions for turning him be met.
The nullification is in his blood. If it leaves his body, it still has nullification properties, though the radius of null is relative to the quantity of blood. It is more effective in a liquid state but still has some effect when dry.