▁bla de ▁in ▁the ▁fourth ▁book . ▁In ▁The ▁Mark ▁of ▁Ath ena , ▁some ▁Tele kh ines ▁are ▁seen ▁in ▁a ▁water ▁tank ▁at ▁the ▁Georgia ▁Aqu arium . ▁ ▁Tro jan ▁Sea ▁Mon ster ▁– ▁A ▁sea ▁mon ster ▁that ▁r amp aged ▁the ▁coast s ▁of ▁T roy ▁until ▁it ▁was ▁s lain ▁by ▁Her acles . ▁It ▁is ▁also ▁known ▁as ▁the ▁K eto ▁Tro is . ▁In ▁The ▁Lost ▁Hero , ▁Jason ▁Grace ▁claims ▁to ▁have ▁sle w ▁this ▁mon ster ▁while ▁fighting ▁P orph yr ion ▁of ▁the ▁G ig antes . ▁ ▁Ty phon ▁– ▁A ▁very ▁powerful ▁mon ster . ▁He ▁s ired ▁many ▁mon sters ▁by ▁E ch id na . ▁He ▁lives ▁and ▁sle eps ▁inside ▁Mount ▁Saint ▁Hel ens . ▁Per cy ▁is ▁such ▁a ▁powerful ▁dem ig od ▁that ▁he ▁almost ▁w akes ▁Ty phon ▁during ▁his ▁visit ▁there . ▁In ▁The ▁Last ▁Olymp ian , ▁Ty phon ▁aw akes ▁and ▁moves ▁across ▁America ▁destroy ing ▁everything ▁in ▁his ▁path . ▁As ▁he ▁is ▁conce aled ▁in ▁mist , ▁Ty ph oon ' s ▁appearance ▁is ▁not ▁described ▁and ▁appears ▁as ▁a ▁fre ak ▁storm . ▁The ▁gods ▁of ▁Olymp us ▁try ▁to ▁stop ▁him , ▁but ▁he ▁is ▁too ▁powerful . ▁In ▁the ▁end , ▁P ose id on ▁and ▁his ▁army ▁help ▁defeat ▁him ▁where ▁P ose id on ▁opened ▁up ▁a ▁tunnel ▁that ▁sends ▁Ty phon ▁into ▁T art arus . ▁Once ▁Ty phon ▁was ▁defeated , ▁a