, ▁and ▁Lad on ▁as ▁well ▁as ▁several ▁others ▁not ▁in ▁the ▁series . ▁She ▁is ▁first ▁seen ▁in ▁The ▁Light ning ▁Th ief ▁as ▁an ▁old ▁lady ▁who ▁owned ▁a ▁ch ih u ah ua ▁which ▁was ▁actually ▁Ch im era ▁in ▁dis gu ise . ▁E ch id na ▁also ▁det ests ▁that ▁there ▁is ▁a ▁mars up ial ▁that ▁was ▁named ▁after ▁her . ▁She ▁assist ed ▁Ch im era ▁in ▁fighting ▁Per cy ▁at ▁the ▁top ▁of ▁the ▁St . ▁Louis ▁Arch . ▁She ▁and ▁Ch im era ▁disappeared ▁after ▁Per cy ▁dove ▁into ▁the ▁water . ▁ ▁Emp ous ai ▁– ▁Sed uct ive ▁shapes h ifting ▁women ▁who ▁are ▁similar ▁in ▁appearance ▁to ▁v amp ires , ▁but ▁have ▁one ▁sh ag gy ▁don key ▁leg ▁and ▁one ▁bronze ▁leg . ▁Two ▁Emp usa ▁pose ▁as ▁cheer le aders ▁in ▁The ▁Battle ▁of ▁the ▁Lab yr inth . ▁In ▁The ▁Last ▁Olymp ian , ▁an ▁un named ▁Emp ous ai ▁appears ▁as ▁part ▁of ▁the ▁tr uce ▁party ▁along ▁with ▁Prom ethe us , ▁Mor rain , ▁and ▁Eth an ▁Nak um ura . ▁She ▁stated ▁that ▁she ▁was ▁among ▁the ▁things ▁that ▁was ▁released ▁from ▁P and ora ' s ▁p ith os . ▁ ▁K elli ▁– ▁An ▁Emp ous ai ▁that ▁pos es ▁as ▁a ▁cheer le ader ▁in ▁The ▁Battle ▁of ▁the ▁Lab yr inth . ▁She ▁was ▁killed ▁by ▁An nab eth . ▁In ▁The ▁House ▁of ▁H ades , ▁K elli