Design

You craft a perfect illusion of a Small or Medium Humanoid. The illusion appears at a point you can see within range. It lasts for the duration or until you use an action to dismiss it. The illusion is a creature which occupies its space. It can take actions and otherwise be affected as a normal creature.

The illusion is so convincing that nonmagical investigation can't determine its true nature. You choose its appearance. The illusion uses the statistics of a generic Humanoid you have seen—for example: an assassin, a werewolf, or a mage, and it appears with any equipment its statistics mention or require. The illusion can't cast spells or use spell slots of 4th level or higher.

 The illusion is aware and can learn. When you cast the spell, the illusion learns whatever information you know and choose to share with it, and you can implant false memories into it's mind.

Whenever something refers to the illusion's proficiency bonus, it uses your proficiency bonus instead of its own. The illusion rolls its own initiative in combat, and if it is reduced to zero hit points, the spell ends.