When Yhwach summons his elite guards, TheSchutzstaffel, Askin Nakk Le Vaar is among those who emerge from his shadow. He is Stern Ritter ”D” - “The Death Dealing”.

“My Schrift is “D”. The name of my power is “The Death Dealing”

“I can accurately calculate the lethal dose of a particular substance… and adjust that amount at will.”

He paused for dramatic effect and you feel very weakened.

“Right now I’m… lowering the lethal dose of your own blood. A slow and painful death…”

D - The Deathdealing: Askin's Schrift grants him precise control over lethal doses. After taking a particular substance into his body (usually by ingestion), Askin can then calculate its "perfect lethal dose" — how much of that substance will 100% cause death — and adjust that value as he sees fit. By lowering lethal doses, Askin can make normally harmless or even vital substances (like blood, Reishi, or select chemicals like oxygen and nitrogen) become deadly "poison" to enemies around him, killing or incapacitating them without needing to attack head-on; for example, by drinking blood, Askin can make opponents be killed by the very blood coursing through their veins. On the other hand, by drastically raising the lethal dose of a harmful substance or energy he absorbs (including an enemy's Reiatsu), Askin can develop an "immunity" to it, such that he becomes invulnerable to his enemies' powers following sufficient exposure to their attacks. Poisoning: By lowering the lethal dose of a substance that enemies are exposed to or hold within their bodies (like blood or Reishi), Askin can make it fatal to them, pushing said enemies towards death. This "poisoning" effect seems to be faster the more Askin ingests of the target substance, and by decreasing the lethal dose of something vital like blood, he can make death all but certain — e.g., Askin may poison his opponent with their own blood so that, if they bleed themself to go back below the lethal dose, they instead die of blood loss. However, particularly strong opponents take considerably longer to be disabled or killed and may require extra-thorough poisoning, due to their high endurance. In order to facilitate the effects of his Schrift, Askin can release a tangible "poison" from his body that appears as a purple-violet (or green) miasma, and which he may either launch as projectiles or expand over the battlefield to make whoever touches it near-instantly succumb to his Schrift's effects.

Askin holds four Gift Balls. Gift Ball: Askin throws a small, slow moving poison ball at his opponents, which is potent enough to make them collapse on the spot.

*Gift Bad: Askin creates a darkened area of influence the size of a large circle on the ground that can reduce someone's tolerance in the atmosphere to the point of poisoning them as soon as they ste Askin's injuries rapidly heal after he develops an immunity to Yūshirō Shihōin's Reiatsu.

Immunity: Askin can develop total "immunity" to any substance or energy to which he is exposed, making it non-fatal to himself by drastically raising the lethal dose involved. This building of immunity, which Askin calls the ultimate way of staving off death, can even extend to abilities: after soaking up the Reiatsu of enemy attacks and upping the lethal dose, Askin becomes "immune" and can no longer be harmed by all subsequent attacks containing the same Reiatsu. This immunity acquisition occurs extremely fast: upon receiving an attack, Askin reflexively analyzes its Reiatsu profile to build his immunity at a terrifying speed, such that he can effectively nullify any attack within one minute. Healing Factor: After developing an immunity, Askin automatically heals all injuries caused by the substance and/or energy to which the immunity pertains. After becoming immune to the Reiatsu of Yoruichi and Yūshirō Shihōin, Askin recovered within seconds from the severe full-body burns inflicted by the sibling's use of their respective lightning and fire Shunkō.