▁Ze us ▁and ▁H ades ), ▁Per cy ▁is ▁more ▁powerful ▁than ▁most ▁of ▁the ▁gods ' ▁other ▁children . ▁He ▁also ▁has ▁a ▁degree ▁of ▁authority ▁over ▁his ▁father ' s ▁subjects . ▁Per cy ▁is ▁gift ed ▁with ▁several ▁semi - div ine ▁ab ilities : ▁the ▁ability ▁to ▁manipulate ▁water ▁and ▁curr ents ; ▁en hanced ▁strength / energy ▁and ▁sens es ▁while ▁near ▁the ▁water ; ▁the ▁ability ▁to ▁bre at he ▁under water ▁and ▁operate ▁old ▁sail ing ▁ships ▁with ▁his ▁mind ; ▁mental ▁communication ▁with ▁marine ▁animals , ▁equ ine ▁animals , ▁water ▁n ym ph s , ▁and ▁some ▁of ▁his ▁relatives ; ▁and ▁the ▁creation ▁of ▁small ▁earth qu akes ▁and ▁h urr ican es . ▁Water ▁also ▁provides ▁Per cy ▁with ▁a ▁measure ▁of ▁protection ▁from ▁injury ▁and ▁fire . ▁All ▁of ▁Per cy ' s ▁ab ilities ▁correspond ▁to ▁the ▁myth s ▁about ▁and ▁ab ilities ▁of ▁his ▁father . ▁ ▁We ap ons ▁ ▁Per cy ' s ▁main ▁weapon ▁is ▁An ak lus mos ▁(" R ipt ide "), ▁a ▁sword ▁made ▁of ▁cel est ial ▁bronze ▁given ▁to ▁him ▁by ▁Ch ir on ▁the ▁cent aur , ▁on ▁the ▁instructions ▁of ▁P ose id on ; ▁the ▁sword ' s ▁history ▁goes ▁back ▁to ▁Her acles , ▁who ▁was ▁gift ed ▁that ▁sword ▁by ▁the ▁n ym ph ▁Zo ë ▁Night sh ade , ▁a ▁daughter ▁of ▁Atlas . ▁R ipt ide ▁can ▁change ▁shape ; ▁when ▁it ▁is ▁not