Mentions of Zeus' infidelity.

Aeolus' Winions suggest that Odysseus kill some of his crewmates to protect the Wind Bag.

The Sirens attempt to kill Odysseus.

TV-14 violence level.

Characters use several curses, from damn to hell.

A few uses of piss, one of badass and bastard.

Scylla and her accompanying song of the same name are both creepy at first but terrifying near the latter's end.

Zeus can be fairly menacing.

The Underworld Saga, given it has lots of ghosts/spirits, is fairly dreadful.

Poseidon, especially in "Get in the Water," is very menacing.

The Sirens attempt to kill Odysseus.