This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
蜐 combines 虫 (insect) with 劫, which likely contributes a phonetic element. The exact historical development is uncertain.
The insect radical 虫 suggests a bug or creature, but the meaning is unclear. Picture a mysterious insect that appears only in old texts.
For キョウ, imagine a strange insect that makes a loud 'kyou' sound when disturbed: kyou -> キョウ, and the insect radical 虫 hints at the creature.
—