User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-202.156.13.11-20121113034012/@comment-3146930-20121201150503

The book states that he didn't have a pilum with him after Gwen had been killed with one, with the insignia of Octavian's cohort on it. The implication is that Octavian stabbed her with it, which was the reason he no longer had one. At the start of the War Games, it is specifically started that every person was armed with a pilum.

"Every legionnaire carried a harpoon like spear called a pilum, a gladius, a dagger, and about a hundred pounds of other equipment."