Rho Aias: The Seven Rings that Cover the Fiery Heavens (Fate/Stay Night) / Seven Rings of Heaven (Fate/Extra English localization).
A Conceptual Weapon stored in the Reality Marble ]] used by _and_Emiya_Shirou_in_Fate/Stay_Night's_Unlimited_Blade_Works_and_Heaven's_Feel_routes._Presented_as_a_purple/pink_energy_shield_composed_of_seven_concentric_circular/flower-petal-shaped_layers_arranged_from_smallest_to_largest,_with_the_largest_facing_the_user.
Each_layer_is_as_strong_as_a_fortress_wall,_and_the_shield_as_a_whole_carries_the_"concept"_of_"blocking_any_projectile_attack."_The_Conceptual_Weapon_is_based_on_Telamonian_Ajax's_(Ajax_the_Greater's)_shield,_which_consisted_of_seven_cowhides_over_a_layer_of_bronze;_during_the_Trojan_War_(according_to_the_Iliad),_the_shield_blocked_all_attacks_aimed_at_Ajax_and_his_comrade_Teucer_without_taking_damage_until_it_blocked_'s spear, which pierced the first six layers before being stopped by the seventh. In the Unlimited Blade Works route, Lancer_uses_'s thrown attack to the same effect in his second battle against Archer. During Shirou's battle against Gilgamesh, Archer used Rho Aias to protect the former, and in the anime adaptation Shirou is shown using the shield during the battle. Also, in the Heaven's Feel route, Shirou used the shield against Saber Alter's in order to protect [[medusa_(fate)|Rider.