I used a Sphynx Salt as a True Kin and entered the Golem. Wanted to see what Ehalcodon was going to do before going in for real. But apparently entering the Golem removed the tonic effect from my character. I wasn't able to test if it removes other effects, but it didn't feel like it should work like that. Rough way to find out, as I didn't make much of an effort to play it safe.