▁a ▁be ard ▁which ▁has ▁numerous ▁tent acles ▁spr out ing ▁from ▁each ▁nost ril . ▁In ▁The ▁Mark ▁of ▁Ath ena , ▁C eto ▁sent ▁Sk ol op endra ▁after ▁the ▁dem ig ods ▁after ▁their ▁escape ▁from ▁Ph or c ys ' ▁aqu arium . ▁It ▁attacked ▁the ▁Ar go ▁II ▁when ▁Leo ▁forgot ▁to ▁turn ▁the ▁mon ster - d ete ction ▁system ▁on . ▁Per cy ▁describes ▁Sk ol op endra ▁as ▁" sh rim p z illa ." ▁Sk ol op endra ▁withdraw s ▁into ▁the ▁ocean ▁when ▁Leo ▁Val de z ▁and ▁Haz el ▁Le ves que ▁throw ▁test ▁tub es ▁filled ▁with ▁Greek ▁Fire ▁into ▁its ▁mouth . ▁ ▁Spart us ▁– ▁A ▁tro op ▁of ▁ske let ons ▁armed ▁with ▁weapons . ▁They ▁are ▁usually ▁sum mon ed ▁by ▁plant ing ▁drag on ▁( S y bar is ) ▁teeth ▁in ▁the ▁ground ▁and ▁water ing ▁them ▁with ▁blood . ▁In ▁The ▁T itan ' s ▁Cur se , ▁some ▁Spart oi ▁amb ushed ▁Per cy , ▁Th alia , ▁Z oe , ▁Gro ver ▁and ▁Bian ca ▁in ▁New ▁Mexico . ▁Due ▁to ▁her ▁being ▁a ▁child ▁of ▁H ades , ▁Bian ca ▁managed ▁to ▁destroy ▁them . ▁In ▁The ▁Son ▁of ▁Ne pt une , ▁Frank ▁( as ▁a ▁gift ▁from ▁his ▁father ) ▁is ▁given ▁a ▁spe ar ▁with ▁the ▁tip ▁of ▁a ▁drag on ' s ▁to oth ▁that ▁when ▁plant ed ▁with ▁raise ▁one ▁of ▁the ▁Spart oi , ▁he