What density the Archangels are from?

[Minyatur]

I'd say a group composed of a 4th, 5th and 6th density hierarchy.

Please, you have any source about this?

I tend to go intuition-based rather than source-based.

I thought this was how the Orion group is presented also in the Ra material, yet I just felt like verifying and now I see there's no sixth density members mentioned and instead only fourth and fifth.
My intuition still tell me there are sixth density members in Lucifer group or perhaps the name in itself refer to a strict sixth density group which then works with other groups like Orion by overseeing them using negative polarity, so I would just lump those two together anyway as one hierarchy across the densities. I think STS groups have quite the volatile members, whereas STO groups are like super-BFFs.

The 6D entities are much like overseers of Free Will in their own way.

I believe that Lucifer is from the Light of the 6D.

Second Ra, Lucifer is a Logos. Is possible an archangel be a Logos or a Logos be an archangel?

I think the portion of the Ra material that used Lucifer alongside Logos did not mean that Lucifer is a Logos but instead that within a Logos was first used the symbolic archetype of Lucifer, that is to grant knowledge of both good and evil to the self through the use of the veil, to extend free will. Prior to this experiment, the negative path was not known and as such Lucifer has a slight different meaning to us now as we tend to use it to refer to the dwellers of the negative path. Still, I think any portion of consciousness is a Logos (sub-Logoi) of itself, but that the Ra material usually use these term to refer to 7D beingness that internalizes a plenum of space and time so that sub-portions of the Creator may experience themselves and grow from within the colors of their beingness.

I guess you could call the first Logos to implement a veil upon its 3D creation the first Lucifer, but that might be misguiding as the intent was truly to offer the Creator experiences of a more satisfying quality and Lucifer usually holds a dark connotation.