Special Part(s): GD_Iris_SeraphItems.ONegative.Iris_Seraph_GrenadeMod_ONegative GD_Iris_SeraphItems.ONegative.Iris_Seraph_GrenadeMod_ONegative_Balance GD_Iris_SeraphItems.ONegative.Iris_Seraph_GrenadeMod_ONegative_Part_Damage6Or: GD_Iris_SeraphItems.ONegative.Iris_Seraph_GrenadeMod_ONegative_Part_Damage7 GD_GrenadeMods.Material.Material_Maliwan_4_VeryRare [O-Negative Variants] O-Negative is a Seraph transfusion grenade manufactured by Maliwan. The O-Negative can only be obtained from trading with the Seraph Vendor in the Badass Crater of Badassitude in True Vault Hunter Mode and Normal or as a drop from Pete the Invincible in Ultimate Vault Hunter Mode.