Ascended Masters is an idea from the Akashic Records aka Noospehere... It is a man made idea gathered and or taken from the Astral plane. There were such alchemists as Leonardo Da Vinci or the one called Saint Germain. None of them transcended beyond the Astral or 4D. The only transcended one is Jesus Christ.

Now, what people do is energize the idea or the "thought form". The more the merrier. They make it real enough so they can channel them form the Astral. The so called Ascended Masters exist as that...as thought form (as everything in the Astral).

The more power people give it, the more powerful the thought form becomes. This is also the hidden secret of "true power" here on 3D Earth...as PTB might say ...it is what you think (they confiscate the human group mind).