Scarlet Turret first appears as a red shadow throughout the second section of the Tziah Block within Tartarus. It will be the subject of one of Elizabeth'srequests and will drop Red Armor Plates while the quest is active. Returning to Elizabeth with 2 Red Armor Plates will complete the quest.
The Scarlet Turret will later appear as a normal enemy in the Harabah Block, from floors 165 to 179.
The Scarlet Turret appears in the 9th Chapter of the Void Quest within the Midnight Channel. It will alternate between casting Agidyne and Mind Charge followed by Agidyne. They are a good candidate for Silence or Confusion skills to be utilized. After defeating it, it may drop the Super-Alloy material. Selling 4 Super-Alloys at Daidara will unlock the Alloyed Plate weapon for Kanji Tatsumi in the shop.
Red Shadows appearing in the 9th Chapter may be a group of three Scarlet Turrets.
In Golden, it appears in Chapters 6 through 9. It may also drop Bloodstone for trade at Shiroku Pub.
Scarlet Turret appears as a sub-boss in the 3rd Avenue of the first Theater, Kamoshidaman. It is used to introduce the concept of Affinity Barriers, which will render it resistant to attacks until the barrier is broken. Afterward, it will be weak to Elec, Wind and Curse skills. The Scarlet Metal it drops will unlock the Crimson Knife for the P5 hero, Violet Saber for Akechi, Ardor Naginata for the P3P heroine, Guard Scarf for Morgana and Fitted Chainmail unisex armor.