If you could have any weapon from the series, which would you choose?
Backbiter. Freakin Steel/Celestial bronze combo would make me indestructible. i might also like Nico's whatever-iron sword
But why would you need Stygian Iron?...
To kill zombies, of course.
KRONOS' SCYTHE!!!!!!!! MUHAHAHAHAHAHAHAHAH!!!!! (Cough, cough) I really need to work on my evil laugh...