For the next minute, you create an exact copy of yourself. It can do everything you can do, and is completely indistinguishable from you. It does not have any of you're magic items, and any you are carrying are replaced with mundane equlivilents, e.g. your +1 longsword is replaced by a longsword.
While the copy is active it is completely under your control, and you gain a hive mind with each other, each of you is aware of everything the other is. It rolls it's own initiative in combat and can act on your will without being comanded to do so.
The copy shares your HP, it has none of it's own. The copy cannot be destroyed by taking damage, it lasts the duration unless you dismiss it as a bonus action, fall unconscious, are incapacitated, die, or if it moves more then 120ft away from you.
If the copy takes any damage, it is transferred to you instead, and you take the equivalent in psychic damage, e.g. your copy takes 7 piercing damage from a shortsword, this damage is reduced to zero, and instead you (the caster) take 7 psychic damage.
At Higher Levels. For every spell slot above 4th extends the duration by 1 minute.
* - (A small, plain doll that matches the physical characteristics of your race, worth at least 100gp)
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