tell them scylla is a bitchhhead
he tells odyssseus to stay close to the rocks but stay in the middle to pass safley
The Underworld and then through the Harpies and sea monsters; Scylla and Charybdis.
the underworld
Hermes advises Odysseus to use the herb Moly to resist Circe's enchantments. He tells Odysseus to draw his sword and threaten Circe with harm if she attempts to bewitch him. Finally, he instructs Odysseus to make Circe swear an oath not to harm him before he agrees to her hospitality.
If Odysseus goes to bed with Circe when she first asks, she will 'unman' him, that is, she will cut off his penis. Hermes tells Odysseus to first make Circe swear that she will do him no harm before he sleeps with her.
Book 12 of the Odyssey.
Not to kill them, which Odysseus warns his men not do to - and which they do anyway to their doom.
Odysseus did not warn hiscrew about Scylla because he was afraid they would all hide under the decks and not fight the monster. He needed them to be brave, so they could escape the narrow passage between Scylla and Charybdis
So that Circe could tell them the warnings of the sea, thus dodging the Sirens.
The land of the deads
The scylla appears in Book XII. This part of the story Odysseus tell of his adventures home so far. He is in Phaeacia, hosted by King Alcinous. These people did not go to Troy and seem eager to hear of the stories from this war.The Scylla appears in the story after Odysseus, on his last ship, have just succeeded avoiding the tempting siren's song, and chose to sail past the Scylla and Charbydis instead of through the Clashing Rocks (which Circe said they'd never survive).
the underworld