In suspense or crime stories, if a character needs to cause harm secretly, they usually use the following methods. These methods often highlight concealment, psychological deterrence, or the use of environmental factors, but please note that these contents are limited to fictional creation discussions, and any form of harm in reality is illegal and unethical. --- ### **1. Drug or toxin manipulation** -**Chronic poisoning**: Through the long-term mixing of trace toxic substances (such as thallium, arsenic, or phytotoxins) into the diet or daily necessities, the symptoms are similar to diseases and are difficult to detect. -**Injection of air or drugs**: Characters with a medical background may use injection to cause embolism or drug overdose, disguised as an accident. - **Hallucinogen manipulation**: The use of hallucinogenic drugs to cause the target to behave abnormally and induce "accidental" injuries (such as falling off a building or a car accident). --- ### **2. Environmental trap** -**Equipment changes**: Adjust the brakes of vehicles, loosen the handrails of stairs, set up conductive wires, etc., to create "accidents". -**Use of natural elements**: Oiling on slippery ground, deliberately inducing allergens (such as bee colonies, poison ivy), or using extreme temperatures (such as turning off heating equipment to cause frostbite). -**Animal induction**: Train animals to attack (such as poisonous snake bites), or use the target's fear of a particular creature to trigger a panic response. --- ### **3. Psychological tactics** -**Gaslight effect**: Long-term psychological manipulation makes the target doubt their own judgment, inducing self-harm or mental breakdown. -**Falsification of evidence**: Create the illusion of the target's "suicide" (such as faking a suicide note, arranging the scene). -**Stress trigger**: Use the target post-traumatic stress disorder (PTSD) to induce uncontrolled behavior through stimuli such as sound and smell. --- ### **4. Indirect means of injury** -**Delay device**: Timing destruction of equipment (such as gas leakage), remote control of electronic equipment (such as pacemaker interference). -**Murder with a knife**: Provoking contradictions among others or hiring a third party to commit harm, and creating an alibi by yourself. -**Misleading information**: Tampering with medical records to delay treatment, or providing incorrect operating instructions to cause mechanical injuries. --- ###**Precautions** -**Legal and moral boundaries**: Fictional plots need to be handled carefully to avoid details that are too specific or operable, and to prevent imitation. -**Rationalized design**: The means of injury must conform to the identity of the character (such as the doctor using poison, the electrician setting circuit traps) and the story logic. -**Suspense core**: The focus should be on motivation, psychological games and consequences, not technical details. In creation, hidden injuries often serve character relationships or thematic discussions (such as collapse of trust, suppression of power). It is recommended to hint at the existence of injuries through profiles (such as abnormal behavior, abnormal environments), rather than direct descriptions, in order to enhance the sense of suspense.