User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-99.152.5.112-20130505055952

What doesnt make any sense, is the fact that rick riordan specifically syas that there are only a very few magical elements that can kill monsters but, i could probably name a hindred examples where a monster dies from something other than celestial bronze or imperial gold. Ex: scorpion balista dont have either broze or gold but they are used on the argo to kill monsters.