I think it has numerous uses. I've been using it to strengthen my body and for various tasks. But I do believe it could used to resist a corrupted Arehtei's influence.

Or when several people join their Dunamis together, to even great possibilities. The city of Shaarnath is proof of that. It has a bubble to keep out the surface poison, that's maintained by the people of that city.

There's a lot it could be used for. Possibly even protection against a corrupted Arehtei's rampaging. To far greater degree than the proposed ideas at the town hall meeting.