Well, yes Rome has invented this. Rome's version is not witnessed if read in context with the other accounts of the Lord's Supper.
Do you realize how absurd it would be for mere men to invent the idea that bread and wine are changed substantially at the hand of Jesus’ priests at the words of consecration into the body, blood, soul, and divinity of Jesus Christ, true God and true Man, the Second Person of the Blessed Trinity made incarnate? Do you think it is easy for Catholics to believe this doctrine in the face of human fleshy wisdom which scoffs and ridicules us? Yet we believe it because He said it.
It is something that only God can do and it is something that only God commanded us to believe. It is right there plain as day in the sixth chapter of St. John. For those who have eyes to see. It is called the “Mystery of Faith” because all of our senses tell us it is bread, except our ears, which are docile to the teaching of Jesus Christ. It is captured well in the Pange Lingua of St. Thomas Aquinas.
Have you read any texts by any of the saints about the doctrine of the Holy Eucharist? A good place to start is the Catena Aurea which contains the commentary of the Early Church Fathers and doctors of the Church on the four gospels.
Here is a sample from the Catena Aurea:
From John Chapter 6:
55. For my flesh is meat indeed, and my blood is drink indeed. 56. He that eats my flesh, and drinks my blood, dwells in me, and I in him. 57. As the living Father has sent me, and I live by the Father: so he that eats me, even he shall live by me. 58. This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eats of this bread shall live for ever. 59. These things said he in the synagogue, as he taught in Capernaum.
St Augustine’r commentary;
Or thus: Whereas men desire meat and drink to satisfy hunger and thirst, this effect is only really produced by that meat and drink, which makes the receivers of it immortal and incorruptible; i.e. the society of Saints, where is peace and unity, full and perfect. On which account our Lord has chosen for the types of His body and blood, things which become one out of many. Bread is a quantity of grains united into one mass, wine a quantity of grapes squeezed together. Then He explains what it is to eat His body and drink His blood: He that eats My flesh, and drinks My blood, dwells in Me, and I in him. So then to partake of that meat and that drink, is to dwell in Christ and Christ in you. He that dwells not in Christ, and in whom Christ dwells not, neither eats His flesh, nor drinks His blood: but rather eats and drinks the sacrament of it to his own damnation.