Vex's Passive Perception

anonymous asks: How on Critical Role does Vex'ahlia with a wisdom of 14 have a passive perception of 21. There has never been mention of a magic item that increases it and no half elf or ranger ability allows some magical huge passive perception boost.

You’re right, it’s not magic item, half-elf ability, or ranger ability: it’s a feat!  Vex took the feat Observant.  It increased her wisdom score by 1, gives her a +5 bonus to passive perception, and allows her to read lips.