Askin Nakk Le Vaar serves as a Sternritter in the Wandenreich, bearing the designation "D: The Deathdealing." He uniquely rose from the lower ranks to join Yhwach's elite Schutzstaffel. His appearance features a tall, slim frame, fair skin, neck-length black hair slicked back save for one strand falling across his face, lavender eyes, and pronounced cheekbones. He wears the standard Sternritter uniform: a light-gray V-neck collar, white long-sleeved shirt, white harem pants tucked into black boots, and a cloak with the Wandenreich emblem, later marked by a red Hagal rune after his promotion. Battle often damages his upper attire, leaving only the collar intact. He exhibits a calm, eccentric, and laid-back demeanor, frequently employing playful banter and sarcasm in combat. Askin embraces self-deprecation, presenting himself as cowardly or ineffective to mislead opponents and gain strategic edges. He avoids prolonged engagements, preferring swift resolutions and expressing irritation when forced into drawn-out fights. His loyalty to Yhwach stems from curiosity about the Quincy king's plan to destroy and remake the Three Worlds, not ideological devotion. He maintains a polite, non-insulting attitude towards enemies, readily acknowledging their strengths, such as during his confrontation with Kisuke Urahara. He is often seen leisurely drinking café au lait from a thermos, even in war zones. His Schrift, "The Deathdealing," manipulates the lethal dosage of any substance he ingests or analyzes. By altering tolerance thresholds, he can render substances like blood, oxygen, or Reishi poisonous within his range. This grants reactive adaptation; exposure to an attack allows him to develop near-instant immunity by raising his own lethal tolerance to the associated energy, negating future damage. It also enables regeneration from injuries sustained before immunity activation. Techniques include "Gift Ball," a slow projectile inducing unconsciousness by altering resistance to compounds; "Gift Bad," a zone lowering resistance to specific substances; and "Gift Ring," a delayed-action ring causing localized fatality. Activating his Vollständig, "Hasshein" ("God's Poison Taster"), enhances his abilities. This form allows automatic adaptation to modified substances if their base composition remains consistent, sustaining immunity against evolving powers. It unlocks "Gift Ball Deluxe," a large-scale version of Gift Ball covering vast areas, combined with "Gift Bereich" to seal the area's borders and prevent escape. The effects of Gift Ball Deluxe intensify upon Askin's death. Beyond his Schrift, he demonstrates proficiency in Quincy archery, martial arts, and wields a Reishi staff in Vollständig for physical combat. He also uses standard Quincy abilities like Blut Vene for defense and Blut Arterie for offense, though not simultaneously. Askin participates in the Wandenreich's second invasion of Soul Society, interrupting a fight between Bazz-B and Jugram Haschwalth by citing Yhwach's disdain for infighting. He later encounters Mayuri Kurotsuchi at the Shinigami Research and Development Institute, analyzing his capabilities before retreating to avoid a protracted battle. He observes Kenpachi Zaraki's fight against Gremmy Thoumeaux while casually picnicking, expressing disbelief at Gremmy's power. Promoted to the Schutzstaffel, Askin accompanies Yhwach to the Soul King Palace. After Ōetsu Nimaiya swiftly defeats other elites, Askin survives an initial strike by partially predicting Nimaiya's movements. He uses The Deathdealing to lower the lethal dose of Nimaiya's blood, nearly killing him until Tenjirō Kirinji intervenes. Revived by Yhwach's Auswählen, Askin confronts Ichigo Kurosaki's allies in Wahrwelt. He battles Kisuke Urahara, Yoruichi Shihōin, and Yūshirō Shihōin, adapting to their techniques until Grimmjow Jaegerjaquez ambushes him, fatally extracting his heart. Despite this injury, Askin remains conscious long enough to acknowledge Urahara's ingenuity before succumbing. Weaknesses include an initial inability to adapt to fundamentally altered substances without reactivating The Deathdealing, a limitation overcome by his Vollständig. External agents like Urahara's incomplete serum can temporarily counteract his power. Physical attacks from Hollows, such as Grimmjow's strike, exploit the Quincy's vulnerability to Hollow-based toxins, bypassing his regeneration.