Corneo's Secret Stash is an Odd Job in Chapter 14, "In Search of Hope", in Final Fantasy VII Remake. While Cloud Strife, Tifa Lockhart, and Barret Wallace search for a way to the Shinra Building, Damon asks them to search for more on the Guardian Angel, who has stolen a key to Don Corneo's fortune.
After talking to Damon, head to the Guardian Angel's hideout on Lookout Point. This is located in the northeast corner of Sector 5 Slums, past Nuts 'n' Bolts Hills, Head east through Steel Mountain and use a ladder, then talk to Mireille. After speaking to her, obtain the Corneo vault note near the hideout, and search for Kyrie Canaan. This intersects with the sidequest "Tomboy Bandit", which is begun by talking to Johnny at the Sector 5 Undercity Station.
Obtaining the key
Kyrie is found in the Sector 5 slums church. After talking to her, she will ask the party to compete in the Corneo Colosseum to give them the key. Here, a battle is fought against an enemy who is weak to Ice but absorbs Fire, meaning the Ice Materia should be equipped. Talking to the gatekeeper and accepting the Special Match in the Corneo Colosseum leads to a battle against a beastmaster and a hellhound. The beastmaster can be defeated quickly with simple attacks, but the hellhound is more challenging with powerful ranged attacks to avoid. Use abilities and ice spells to stagger it, then lay into it with abilities from all three characters.
After winning the battle, return to Kyrie, leading to a cutscene, after which Kyrie will give them the key (as well as Johnny's wallet if "Tomboy Bandit" was accepted).
Corneo's stashes are found in different locations.
- In the Steel Mountain (located northeast of the Sector 5 Slums Center District), just north of the Sam's Delivery Station point. The stash contains a Prayer Materia, a ruby tiara, a circlet, two moogle medals, four bottles of adrenaline, three Molotov cocktails, two maiden's kisses and 3,000 gil.
- In the Collapsed Expressway by the northern entrance. After entering, head west into a tunnel and open the gate. A diamond tiara can also be obtained inside, and several moogle medals.
- In the Sewer System at the Old Trunk Line - Control Section - Former Disposal Area. This can only be obtained later after beginning the quest "Through the Underground Waterway", during "Fateful Decisions". While following Leslie up a ladder in the Old Trunk Line, a lever appears beside him. Pull it, and the Corneo stash will appear on the map further back, near where the Abzu shoat who stole Leslie Kyle's pendant was chased to. When arriving here, a sahagin prince and two sahagins are fought. After defeating them, an emerald tiara, an enfeeblement ring, and a bottle of elixir can be obtained.
After all stashes are looted, Tifa will suggest talking to Marle in the Sector 6 Evergreen Park and give her the tiaras. Talking to her will reward the player with The Art of Swordplay Vol. III (providing 10 SP for Cloud's weapons).
Hard mode tips
For the sahagin prince battle in the Sewer System, it may be ideal to pair Barrier Materia and Magnify Materia and cast Barrier on everyone to resist physical damage. In addition, Barret's Lifesaver should be used, along with Steadfast Block Materia on Barret and Cloud, and Parry Materia on Tifa. Pairing Elemental Materia with Fire Materia is ideal for the battle. Because items are not available, avoid the sahagins' curse at all costs to avoid Toad. Defeat the smaller sahagins first by attacking them after their Jump is finished, and focus on the prince after, by staggering it and then using Tifa's Unbridled Strength and True Strike while hammering it with attacks from Cloud and Barret.
Defeating the prince earns Tifa's Way of the Fist Vol. XII.