Datura

Lore & Background

In the pharmacopoeia of Maomao's world, Datura is catalogued alongside other nightshade relatives as a plant of dual nature. Its seeds, small and angular, are easily dried and stored in a silk pouch, making them a favoured vehicle for those who wish to poison without the trace of a metallic compound. The alkaloids they carry block the muscarinic acetylcholine receptors throughout the body, effectively starving the parasympathetic nervous system of its signal. The result is a cascade: the pupils dilate and fix, the skin goes bone-dry, the heart races, and the mind, deprived of its usual inhibitory tone, erupts into vivid, often terrifying hallucinations. Victims describe seeing insects crawling on walls, hearing whispered conversations, or perceiving the room itself breathing. It is a poison that makes the body betray the mind, and the mind betray sense.

Maomao's relationship with Datura is that of a master who respects a dangerous tool. She can extract scopolamine in controlled quantities for legitimate ophthalmic use, and she knows the precise threshold at which a therapeutic dose tips into a lethal one. In the harem, where rivalries are conducted through whispered slanders and carefully placed cups of tea, the ability to distinguish a Datura poisoning from a genuine febrile illness or a stroke is not merely academic—it is the difference between saving a concubine's life and watching her thrash in a delirium that no one else can explain. Her diagnostic method is characteristically sensory: the absence of sweat in a febrile patient, the fixed dilated pupils, the anticholinergic 'mad as a hatter' presentation, and above all, the faint sweet-earthy smell that clings to the seed husks.

The plant's cultural weight in the story's setting is considerable. Datura has long been associated in East Asian folk tradition with both shamanic vision and criminal poisoning, a duality that mirrors the series' broader theme: the same knowledge that heals can kill, and the apothecary who holds that knowledge walks perpetually between the two. Maomao treats it with the same detached professionalism she brings to every substance in her cabinet—no fear, no reverence, only the precise question of dose, route, and timing.

Reader's Guide

In-world name: Mandala (曼陀罗), also called 'thorn apple' or 'devil's trumpet' in common parlance.

Botanical origin: A member of the Solanaceae (nightshade) family. The toxic principles are concentrated in the seeds and, to a lesser degree, the flowers and leaves. In the harem's apothecary stores it is kept in a sealed glass vial on the locked shelf, labelled with the standard warning mark for anticholinergics.

Preparation and concealment: The most common method in the story's world is the dried seed, either whole (bitter, easily noticed) or ground into a fine powder that dissolves invisibly in tea, broth, or wine. A tincture of the dried flower can also be applied topically to a handkerchief or pressed to the temples, producing milder but still dangerous systemic effects. Because the alkaloids are heat-stable, boiling does not destroy them, which makes a 'poisoned tea' scenario particularly plausible.

Symptom timeline: Onset typically 15 minutes to 2 hours after ingestion. Early signs—dry mouth, blurred vision, mild confusion, flushed dry skin—can be mistaken for heatstroke or a simple fever. Peak (1–4 hours) brings fixed dilated pupils, tachycardia, urinary retention, and the hallmark delirium: vivid visual and auditory hallucinations, agitation, and a 'picking at the air' behaviour. In severe or prolonged cases, hyperthermia, seizures, and respiratory depression follow, with death possible within 12–48 hours if untreated. Recovery, when it comes, is slow; residual confusion and memory gaps may persist for days.

Treatment Maomao devises: Her first intervention is supportive—cooling the patient, preventing injury during the agitated phase, and maintaining hydration. The definitive antidote she employs is a cholinesterase inhibitor (physostigmine in modern pharmacological terms, rendered in-world as a carefully dosed extract from a cholinergic herb), which restores acetylcholine at the muscarinic receptors and reverses the anticholinergic blockade. For severe agitation and hallucinations, she administers a sedative tincture (a benzodiazepine analogue in the story's herbal pharmacopoeia) to protect the patient from self-harm while the alkaloids are metabolised. She also induces emesis or performs gastric lavage if the ingestion is very recent, and she monitors the patient's pupils and pulse at regular intervals to gauge the depth of reversal.

Recurring tool or one-off: Datura belongs to the broader category of anticholinergic poisons that Maomao encounters throughout the series. It is not a single-arc gimmick but a representative of a whole class of botanical toxins that recur in different guises—sometimes as a deliberate murder weapon, sometimes as a misapplied medicine, sometimes as a test of Maomao's diagnostic acumen under pressure. Its specific re-appearance in later arcs is a running motif: each time, the presentation is subtly different (different route, different co-ingestant, different victim's age and constitution), and each time Maomao must re-derive the treatment from first principles rather than simply repeating a formula.

Spoiler note: The exact arc in which a Datura poisoning is the central mystery is left unmarked here to preserve the reader's experience. What is certain is that the case turns on Maomao's ability to recognise the anticholinergic signature in a patient whose symptoms have been deliberately obscured by a concurrent febrile illness, and on her confrontation with the person who had access to the seed stock in the apothecary stores.