STR doesn't exist, so how to score it?

[Werozzi]

Maybe the STR attribute reflects how strong is the creature's manifestation in this plane, going from a vague shadow at STR 3 to an almost solid-looking appearance at STR 18+.
And/or, if it relies in some object to manifest itself (EG, a holo-projector or some sort of item), it can represent how far the image can go from the projector without disappearing. Consider both ideas as some kind of signal strength rather than physical strength.

A a pair of questions;
Can it interact in some way with other beings, via speech or otherwise?
Is it of organic origin?