Soon after being attacked by a Druktar, I got the following echoes I never noticed before:

1) Suddenly a gale rises around you, striking at you with its full force.
=> No idea what that is.

2) A painfully chilling cloud of black fog rolls over you.
=> think this one is what poisoned me...

3) Striking without source or sound, a flash of red lightning flickers overhead.
=> No idea what that is.

Can someone tell me more about how they affect me and confirm if they are Scion's power related?

So I think you won't get an exact description of what does what game mechanically from the Imms. And it's possible some stuff is there just for general color/awesomeness ( I don't really know). But the main thing, most of the things that affect you, and (as far as I know) all pk-relevant affects of cabal powers, will be listed in your affects.

I had these happen to my character before he was level 11 and walking through Galadon the other day. I had no idea what it was. Checked affect, but wasn't anything there either. Just seemed like completely random echos to me, unless they were triggered for the whole room I walked through.

Just chiming in! ;)
-Dano

They are Scion power related.