Revealed to me in a dream:
The "eggs" are actually beads that, when you get all of them, will combine to form a type of rosary. Since getting thee eggs represent helping Kris through mental trauma, the "tail of hell" refers to this process being incomplete, preventing you from fully linking the rosary and leaving that trauma unfulfilled.
This doesn't mean I think there will be five more eggs to get (although I think the Tem egg will be relevant), that part's more symbolic.