Chameleon pores and skin can also be a freebie: it’s a passive capacity that grants benefit on Stealth Checks. No tactical implication; it just will make the yuan-ti superior at what it currently does.
Darkvision – https://crithitceramics.com/the-importance-of-setting-in-a-campaign-a-guide-for-yuan-ti-pureblood-monks/