Special Part(s): GD_GrenadeMods.A_Item_Legendary.GrenadeMod_NastySurprise GD_GrenadeMods.A_Item_Legendary.GM_NastySurprise GD_GrenadeMods.Delivery.Delivery_NastySurprise GD_GrenadeMods.Material.Material_Hyperion_5_Legendary [Nasty Surprise Variants] The Nasty Surprise is a legendary grenade mod manufactured by Hyperion. Nasty Surprise is obtained randomly from any suitable loot source but has an increased chance to drop from Vermivorous The Invincible.