Changeling arms/legs takes over your mind

[Kaet]

Headspiders keep absorbed bodies, though, as far as I know.

I do like this. Changeling seeding isn't the only reason to attach a foreign arm to a person - you could always do it to hope that arm rejection will eventually murder the person. But for this to work, arm rejection should be chance based imho, and changeling arms should never be rejected by the body.

I thought they didn't keep it since its just a pretty small part of your body that leaps onto a new body. Figured DNA junk would be left behind or something.
Though I just guessed that was what happened and I do not actually know.

Perhaps when you attach the limbs to people you can also get the option to have the limbs beat the people as well? That could help you if someone is actively resisting your attempt at taking over their mind.
Beat them unconscious first and then take over their mind while they're knocked out.
Or just beat them dead and find their body to absorb later.