▁a ▁sword , ▁it ▁appears ▁as ▁a ▁ball point ▁pen ▁eng ra ved ▁with ▁its ▁name . ▁It ▁re app ears ▁in ▁the ▁character ' s ▁pocket ▁when ▁lost . ▁Since ▁it ▁is ▁made ▁of ▁cel est ial ▁bronze ▁it ▁will ▁harm ▁gods , ▁dem ig ods , ▁and ▁mon sters , ▁but ▁simply ▁passes ▁through ▁mort als . ▁Per cy ▁has ▁also ▁used ▁magic ▁j avel ins ▁made ▁by ▁his ▁brother ▁T ys on , ▁mag ically ▁cam ou fl aging ▁arm or ▁made ▁by ▁Charles ▁Beck endorf , ▁and ▁the ▁wand ▁of ▁Carter ▁K ane . ▁In ▁The ▁Sea ▁of ▁Mon sters , ▁his ▁half - bro ther ▁T ys on ▁gives ▁him ▁a ▁w rist watch ▁that ▁changes ▁into ▁a ▁shield ▁covered ▁with ▁designs , ▁but ▁the ▁watch ▁is ▁dam aged ▁in ▁The ▁T itan ' s ▁Cur se ▁and ▁lost ▁in ▁The ▁Battle ▁of ▁the ▁Lab yr inth . ▁ ▁Per cy ▁has ▁several ▁mag ical ▁items ▁obtained ▁from ▁batt les ▁against ▁mon sters . ▁The ▁first ▁of ▁these ▁is ▁the ▁horn ▁of ▁the ▁Min ota ur , ▁which ▁he ▁obtain s ▁after ▁killing ▁the ▁be ast ▁on ▁Half - B lo od ▁Hill . ▁Another ▁is ▁the ▁head ▁of ▁Med usa , ▁which ▁he ▁cut s ▁off ▁after ▁killing ▁the ▁g org on . ▁He ▁gives ▁the ▁head ▁away ▁several ▁times , ▁finally ▁leaving ▁it ▁with ▁his ▁mother , ▁who ▁" dis poses ▁of ▁it ". ▁He ▁also ▁obtain s ▁a ▁bullet - ▁and ▁sword - proof ▁l