▁ 3 0   ft . ▁M essen ger ▁of ▁the ▁G ig antes ▁with ▁orange ▁drag on - like ▁legs . ▁He ▁oppos es ▁Herm es / Mer cur y . ▁Hi pp ol yt os ▁makes ▁a ▁minor ▁appearance ▁in ▁The ▁Blood ▁of ▁Olymp us . ▁ ▁M imas ▁– ▁The ▁ 2 5   ft . ▁G ig antes ▁with ▁char co al - color ed ▁drag on - like ▁legs . ▁He ▁oppos es ▁He pha est us / V ul can . ▁M imas ▁makes ▁a ▁minor ▁appearance ▁in ▁The ▁Blood ▁of ▁Olymp us . ▁ ▁Or ion ▁– ▁A ▁ 2 0   ft . ▁G ig antes ▁who ▁oppos es ▁Apol lo ▁and ▁Ar tem is / D iana ▁and ▁is ▁exclusive ▁to ▁this ▁franch ise . ▁In ▁The ▁Hero es ▁of ▁Olymp us , ▁Or ion ▁is ▁sent ▁by ▁G ae a ▁to ▁h unt ▁down ▁N ico ▁di ▁Ang elo , ▁Re yna ▁Av ila ▁Ram í rez - A rell ano , ▁and ▁G le es on ▁H edge ▁throughout ▁their ▁journey ▁of ▁bringing ▁the ▁Ath ena ▁Par then os ▁from ▁Greece ▁to ▁New ▁York ▁in ▁attempt ▁to ▁stop ▁the ▁two ▁cam ps ▁from ▁destroy ing ▁each ▁other . ▁He ▁nearly ▁catch es ▁them ▁numerous ▁times , ▁but ▁they ▁either ▁shadow ▁travel ▁away ▁before ▁he ▁has ▁the ▁chance ▁or ▁are ▁saved ▁by ▁al lies ▁( such ▁as ▁the ▁Hun ters ▁of ▁Ar tem is ▁and ▁the ▁Ama z ons ). ▁Or ion ▁mur