The katakana syllable ヰェ (wye). Its equivalent in hiragana is ゐぇ (wye).

one thing

the past / ancient times

(not of a person) old, aged, antiquated

old

(informal) word written in katakana, i.e. a loanword. In particular, it refers to foreign words that are not so popular in Japan and whose meaning is not well understood.

first, initial / one-eyed

Mongolia

one-eyed goblin, a Japanese monster

Inner Mongolia (an autonomous region of China)