Aeneid VII 568-71

[cinefactus]

Hīc specus horrendum et saevī spīrācula Dītis
mōnstrantur, ruptōque ingēns Acheronte vorāgō
pestiferās aperit faucēs, quīs condīta Erīnys,
invīsum nūmen, terrās caelumque levābat.

I am struggling to make any sense of the last part. Does anyone have an idea? Is it referring to the cave spewing forth sulphurous gases perhaps?

 

[Bitmap]

I'm not entirely sure ... I took it that Erinys, the goddess of fury (not sure why he uses singular, since there were 3 ... I suppose the singular just stands for the plural here), is hiding/concealed down there and that by the fact that she's down there and not on earth, heaven and earth are relieved/ at ease/ free from her evil. I suppose there must be a concrete myth behind this, but I don't know any details. I just know that the Furies live down there in the underworld and sometimes come to earth to drive people mad.

The i in condita is short btw.

 

[cinefactus]

That would make sense I guess. When she is hidden in it, she relieves the upper world by her absence.

 

[AoM]

Yup. Referring specifically to Allecto.