>>95901024
>There's not really much more left of skitarii
Their codex says it varies from individual to individual. Which is dumb, to be honest. Logistics would be horrendous if one Skitarius couldn't be used as spare parts for the next one.
It would make more sense if it varied on a forgeworld basis - one forgeworld adding brain circuitry for direct control, but going with simple peritoneal-diffussion tank lungs because they aren't politically influent enough to pry the secrets of 2-way cyber-alveoli from the next forgeworld over.

Wounded, specially willfull skitarii get converted into Thallax. The other, more successful ones eventually pass the Crux Mechanicum (more machine than man) and attain stalkerhood, like Ruststalkers and Infiltrators.
Though if they aren't particularly bright, they become Pteraxii instead