Elves as "closer to nature and lower-tech" - give them a revulsion to metal?

[Anaraxes]

Originally Posted by Anders

We don't really have a good system for touching a material giving you a condition - it's something that's lacking.

A reversed Environmental (Powers 110). The normal form requires something "touching or surrounding the target" for the ability to work. Reverse it to something touching or surrounding the caster preventing the ability from working. (Or just apply a penalty, to make it a little softer.

Environmental tries to distinguish between activation and effect (you can activate your Root ability, but it doesn't do anything without vegetation -- which skates the edge of a distinction without a difference). It cites Accessibility for conditions that affect activation. So you could also just make "Not touching iron" or "Only TL 0 materials" your Accessibility condition. The positive form can still be used -- e.g., buy those couple of levels of IQ that work "Only in a TL 0 Environment".

Put Trigger ("requires exposure to a specific substance or condition") on a Disad.