From S0:

CurioNotes
Obsidian skull on a velvet cushion, green light pulsing in its eye socketsBought from a street merchant in Port Nyanzaru, who called it a Chultan something and gave it a “Chultan vibe check”. It flares when someone comes within 5 ft. Purpose unknown.
Iron-banded “phylactery jar” with runes and swirling, thumping smokeSyndra’s accidental DIY Halloween prop (she was trying to make a lamp). Static shock; “the last one who touched it, their hair caught fire.”
Huge gnomish astronomical clock ticking backwards, one heavy tick a minuteHer sourdough timer, made “extra ominous”. Doesn’t match Quill’s watch.
Gaudy stained-glass serpent devouring the sun, glowing neon pink and orange every 30 secondsSame Port Nyanzaru merchant. Spoke to Kale: “That’s supposed to be me. Why am I magenta?” It’s meant to be some old deity, and to anyone who knows, it’s an insulting likeness.

The party is now in Port Nyanzaru. Who is that merchant?