This mod allows you to enact the slavery policy and the cast system respectively regardless of what ethos or government did you choose. This mod isn't made by me per se. I took the structure from Rob (links will be put in the description) and updated for the last version.

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Unethical slavery

Unethical slavery

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Warning there is a common random bug: When you enact the caste system the enslaved symbol on a respective pop might not appear. If this happens just try...