Chameleon Skin is likewise a freebie: it’s a passive ability that grants edge on Stealth Checks. No tactical implication; it just makes the yuan-ti much better at what it now does. Yuan-ti are snake-human hybrids, https://crithitceramics.com/the-importance-of-setting-in-a-campaign-a-guide-for-yuan-ti-pureblood-monks/