You have two identical bodies: the twins. All of your character statistics are shared between the two twins, except for the following:
The twins have each their own pool of hit points. If the twins are further than 100 feet apart from each other, each twin becomes gored (half) until they are within that range again.
The twins have each their own movement speed, which is equal to your movement speed.
The twins gain each conditions separately, except for the charmed, dazed, frightened, mad, paranoid, sleeping, and stressed conditions.
The twins are both affected by the same effects, unless they are further than 100 feet apart or if it's a healing effect.
You have the following features:
You have advantage on saves against the charmed, dazed, frightened, impaired, mad, maimed, paranoid, possessed, sleeping, and stressed conditions, provided one twin is within line of sight of the other.
When you use a feature that requires concentration, you choose which twin concentrates on that feature, but only one twin can have the concentrating condition at a time.
When you take the Spellcast action, you choose which twin is the origin of the spell's effect. Morever, you can take the Spellcast action while bound (arms or hands), impaired, or silenced, provided only one twin has any of these conditions.
The twins share telepathy with each other while they are on the same plane of existence.
The twins make death saves separately. When a twin is dying, the other twin becomes incapacitated. If a twin dies, for each 24-hours that pass while that twin is dead, the surviving twin gains a level of exhaustion, which can't be removed except for a wish spell.