大方廣圓覺修多羅了義經略疏 2.1426

2.1426

其數十萬，一一若斯。依附深山或居巖穴，其形可畏，通變極多。不屬人、天，住居鬼趣。

Their number was a hundred thousand, every single one like this. Relying on deep mountains or dwelling in rock caves, their forms are fearsome, and their supernormal transformations are extremely numerous. Not belonging to humans or devas, they dwell in the ghost destiny.