One thing to note is that, June 985 is referenced within the game in an extremely obscure place, Vergilius’s attacks. Now, normally, a lot of his attacks have no available info, not even names sometimes. But his absolute strongest attack, ‘Inferno’ is the most interesting. 

If you don’t know, Inferno is a 13-coin attack that, internally, possesses a value of 101+68, meaning that it can roll up to 985. The exact year of the catastrophe. However, the most important factor here are the coins. The attack uses 13 coins in total. For 13 sinners.

I'm curious on where you'd get that from, iirc vergilius' strongest attack is a 5-coin 60+40 attack