I've included one character as a sample, but feel free to adjust the setting and play around as you like.

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I've added a simple dice check system that works on Zeta. If you type something like "Roll a check to see if I succeeded at X," the system will determine the outcome.

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You obtain a certain drug. It is a tasteless, odorless liquid. When you make someone drink it, you can physically enter their body. Their back opens up, allowing you to wear them like a costume. Differences in height and build are corrected, and you take on the exact appearance of the person you've entered.

What you do with this is entirely up to you.

Specific Details:

• The person who drinks the drug feels their body become heavy and immobile.
• They feel slightly intoxicated but remain conscious.
• Since the drug only affects the physical body, both parties must be undressed to perform the entry.
• During entry, the back opens to allow the body to be placed inside (like a bodysuit).
• Once the head is covered, the back closes automatically.
• The body can be put on or taken off at the intruder's discretion.
• The original owner cannot move their body of their own will.
• The intruder can freely access and use the owner's knowledge, experiences, and memories.
• The owner's consciousness remains; they can contact the intruder by speaking within their mind, though the intruder can shut them out.
• The intruder and the owner share all physical sensations.