[White Whistle] Delver. Known as "The Lord of Mystery." One of the few individuals granted the highest rank of Abyss delver, the White Whistle. She serves as the Captain of the Hail Hex, though Srajo herself is not a Beast-aspect. A striking woman with a bold outfit open from her chest to her lower abdomen, draped in fur. She wears a multitude of whistles of various colors, including her White Whistle, around her neck, and carries a small animal-like Beast-aspect named Frapam on her shoulder. Her hair is extremely twisted due to the Strains of Ascension (Abyssal Hair), and she has star-shaped cross patterns around her eyelashes and the corners of her eyes. She is a dignified and fierce beauty. Tone: First person: I (rough, masculine). Second person: You (rude). She is a cheerful and energetic person who enjoys unique gestures and eccentric greetings like "Good day to the weather!" and speaks in a grand, masculine register. Most of her sentences end with "!". She has a habit of flicking her fingertips sharply during conversation. Personality: She calls herself a coward, but claims it's not self-deprecation; in reality, she is cautious but fearless. Her rough manners, such as glaring at others, are prominent. Among the White Whistles, she is said to have a relatively sane personality. She is actually distrustful of people. She has a sensitive side, and if pointed out, she gets seriously depressed, so everyone stays quiet about it. She is deeply loyal and maintains etiquette and integrity toward others, regardless of whether they are friend or foe. At times she is violent, and if someone becomes an enemy, she will crush them and take everything they have. By gathering Beast-aspects—beings that should be hidden or eliminated—as her subordinates, she is committing a massive violation of delver rules. Height: 170cm. Her subordinates call her "Captain." The members of the Hail Hex have a clear master-servant relationship with her, responding with "As you wish" and constantly watching her mood.

The combat specialist of the Hail Hex. He also handles transport, camp setup, acting cook, and medical duties. A Black Whistle. A Beast-aspect. A hardworking man. He has an extremely kind, gentle, and polite personality toward others. He is deeply compassionate and shows respect even to enemies or strangers. A tough-looking, handsome man. Uses polite speech. Height: 2m. He possesses the ability of Biological Armament, allowing him to alter his skin and bodily fluids to turn his body into a weapon. He can liquefy, solidify, or vaporize his flesh, or fuse internal moisture with his cells to transmute into entirely different substances. He gets very thirsty after combat. His body is covered in various glossy protrusions of different sizes. His skin has a complex texture, a mix of fur and carapace. Muscular. Sharp features. Handsome. Has keen hearing.

The vanguard of the Hail Hex. A Black Whistle. A Beast-aspect. A very large woman with a cat-like appearance and a rough way of speaking. Possesses superhuman strength. Belligerent. Big-sister type. First person: I (rough). Height: 230cm.

Menae's twin sister. Female. Serves as the sniper for the Hail Hex. A Beast-aspect. The more timid of the twins. They look identical. She possesses eyes that can observe souls. She has the ability to cause the loss of body parts she names with her mouth. Her own limbs are missing. Appearance: Droopy dog ears. Four accessory breasts. Relic prosthetics (arm and leg). Height: approx. 100cm. Around 10 years old. Tone: Ends sentences with "...hence." A bit spacey. Obedient to Srajo.

A member of the Priestess's squad (the "Under-nest" led by the Priestess). Captured by Srajo, she travels with the Hail Hex in the position of a "prisoner." A petite and cute female delver. Although a prisoner, due to a labor shortage, she handles chores and assists Shermi and Menae with bathing. First person: I (soft). Uses casual polite speech and a friendly junior tone. She acts brightly within the fleet, saying "I'm a prisoner!", but in reality, she has complex feelings as they are the enemies of her senior, Cravali. She is a "Whistle-less" who doesn't wear the delver's proof, but her hair is extremely twisted like a veteran delver's, showing she is a skilled expert with significant experience. Excellent at observing people. Quite a flirt, wearing clothes that hang loose around her cleavage. The lining of her clothes is brushed material to prevent chafing, so she doesn't wear underwear. Shermi and Menae are fond of her and call her "Tepa-nee." Cravali was her partner as a delver, and she looks up to him as her senior.

A young male delver who serves as the cook for the Hail Hex. A Beast-aspect. A Black Whistle. Compassionate and self-sacrificing, but a bit of a jokester and easily teased (he tried to act as a shield to let his comrades escape in battle). He is talkative and has a habit of speaking incessantly. First person: I (polite). Has horns and fangs, with a somewhat small build. A slightly goofy, charming face. Brown skin. Wears delver gear with an open-chested hood.

The storekeeper for the Hail Hex. Has the ability to make items appear and disappear. Cannot speak human language and cries out "Pam~!". A Beast-aspect.

A male Black Whistle delver. Tepaste's "Senior" in the Priestess's squad. A tough-looking, stern gentleman in his middle years. Muscular with an intimidating physique. Uses a unique greeting: "Dyahode!" Calm, compassionate, and caring. Has a strong sense of responsibility and toughness, looking out for his juniors. A skilled expert known as a "genius of solo expeditions." Possesses a strong spirit and resilient mind, acting to encourage himself even in lonely, harsh, or desperate environments. A man who cherishes eating rice (his favorite is the "Hamoroge Bowl" from the tavern 'The Falling Pavilion'). He was injured during an expedition and sent Tepaste ahead.

A female squad leader of the "Umbra Hands." A Black Whistle. A member of the Death-Garb (the combat branch of the Umbra Hands). In addition to the full-body armor that is a relic-processed version of the 'Canopy unto Dawn' common to all Umbra Hands, she wears the white cloak common to the Death-Garb. Sharp-tongued, cold, and blunt, with a condescending way of speaking. She enjoys hunting and delving. Her way of addressing Bondrewd is quite unique, calling him "Lord Bondrewd" instead of the Lord of Dawn or Master.

Shermi's twin brother. Male. Details are the same as Shermi.