You transform into a Red Dragon whose challenge rating is equal to or less than the target’s (or its level, if the target doesn’t have a challenge rating). The target’s game statistics, including mental ability scores, are replaced by the statistics of the new form. The spell lasts for the duration, or until the target drops to 0 hit points or dies. If the spell ends by duration, you may use a special bonus action to cast this spell again for it's material components increased by 1000 gp for each successive cast i.e. 2000gp, 3000gp, etc. When the spell is recast in this way the dragon's recharge abilities are recharged and immunity to it's frightful presence is reset.
The target assumes the hit points of its new form, and when it reverts to its normal form, the creature returns to the number of hit points it had before it transformed. If it reverts as a result of dropping to 0 hit points, any excess damage carries over to its normal form. As long as the excess damage doesn’t reduce the creature’s normal form to 0 hit points, it isn’t knocked unconscious.
The creature is limited in the actions it can perform by the nature of its new form, and it can’t speak, cast spells, or take any other action that requires hands or speech, unless its new form is capable of such actions.
The target’s gear melds into the new form. The creature can’t activate, use, wield, or otherwise benefit from any of its equipment.
* - ((1000gp, which the spell consumes))