[3.5] "Look, whatever you're thinking, do me a favor; don't let go."

[Xefas]

So if you have multiple reforged mythos only one material can be used but what about the manifestions do only the active reforged mythos manifestions work or do all of them
Work,
Ex. I have the admantium and thinuan mythos and the manifestions to ignore damage reduction and heal for holding a soul respectively do both of these remain active or only the way tied to my material type

You can only benefit from the Reforged Mythos that actually applies to the material that your body is made out of, and that includes the manifestations. So, if you're made out of Adamantine, you don't get anything associated with the Thinaun Mythos.

Unless you have a Bellator in the party, and he forges you out of both materials.