▁Lad on . ▁Besides ▁the ▁ability ▁to ▁open ▁lo cks ▁with ▁his ▁mind , ▁inherited ▁from ▁his ▁father , ▁he ▁is ▁first ▁and ▁for em ost ▁an ▁excellent ▁s words man . ▁He ▁even ▁receives ▁a ▁sword ▁named ▁" Back b iter " ▁from ▁K ron os ▁at ▁the ▁end ▁of ▁The ▁Light ning ▁Th ief . ▁It ▁is ▁later ▁ref org ed ▁as ▁K ron os ' s ▁sc y the ▁and ▁has ▁the ▁ability ▁to ▁harm ▁both ▁mort als ▁and ▁imm ort als . ▁From ▁Hal cy on ▁Green , ▁he ▁receives ▁a ▁di ary ▁he ▁later ▁entr ust s ▁to ▁Ch ir on , ▁and ▁a ▁cel est ial ▁bronze ▁kn ife ▁he ▁later ▁gives ▁to ▁An nab eth ▁with ▁a ▁promise ▁to ▁always ▁remain ▁her ▁family . ▁From ▁his ▁father ▁he ▁receives ▁a ▁pair ▁of ▁magic ▁flying ▁sho es , ▁which ▁he ▁later ▁curs es ▁and ▁gives ▁to ▁Per cy . ▁Just ▁before ▁giving ▁himself ▁over ▁completely ▁to ▁host ▁the ▁spirit ▁of ▁K ron os , ▁Luke ▁bath es ▁in ▁the ▁River ▁St y x ▁and ▁obtain s ▁the ▁inv inci b ility ▁of ▁Ach illes . ▁ ▁Th alia ▁Grace ▁Th alia ▁Grace ▁is ▁the ▁daughter ▁of ▁Ze us ▁and ▁B ery l ▁Grace , ▁a ▁TV ▁star let . ▁She ▁is ▁seven ▁years ▁older ▁than ▁her ▁brother ▁Jason ▁Grace ▁and ▁appears ▁in ▁The ▁Light ning ▁Th ief , ▁The ▁Sea ▁of ▁Mon sters , ▁The ▁T itan ' s ▁Cur se , ▁The ▁Last ▁Olymp ian ,