[Micah]

They have a pretty severe horror marking chance actually (the DB says "50" which I assume means 50% chance per turn?) Though a couple of marks isn't a big deal to most SCs unless they get really bad rolls on the horror checks and end up with a Doom Horror. They also have a slight chance of lost in time and space, but I don't think it's cumulative, so it depends what you mean by "eventually."

Anything lost in the void without S is pretty much gone for good though, even if they do make it back you'll be stuck between letting them be feebleminded forever or (if you can heal it) making them into a stationary defensive unit as their insanity score will go over 100% pretty quickly, barring a VERY lucky get out of void free roll in the first few turns. Fun fact: feebleminded cancels shattered soul and insanity.