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Locked chests appear all over Tartarus inPersona 3 Reload, and they’ll require Twilight Fragments to open. The location of locked chests on the regular floors of Tartarus will disappear when you leave, but the chests on floors with the Gatekeeper Shadows are permanent. The treasures on Gatekeeper Floors usually contain exclusive armor and weapons. You will need to unlock one of these Gatekeeper Floor-chests to get theOte-gine Spear, which is used for completing one of Elizabeth’s Requests inPersona 3 Reload.
How to Unlock Ote-gine Spear in Persona 3 Reload
Ote-gine Spear Stats & Weapon Class
On Floor 143 (Tziah Block), you will have to defeattheIsolated CastleGatekeeper. This Shadow is powerful andcan only be harmed with Slash, Strike, or Pierce. It willnull/blockany magic, so your best strategy is to bringteammates (i.e, Aigis, Akihiko, Shinjiro) and Personas with physical skills. You’ll want Personas that can Buff and Debuff your team, and having a healer (or Yukari) can greatly help as well.
Once you defeat the Isolated Castle, you’ll findthree treasure chests across from the Monad Passage door. The onein front of the ‘waterfall’contains theOte-gine. You will needthree Twilight Fragmentsto open the locked chest.

The best way to farm Twilight Fragments is to work on Social Links, but sometimes Elizabeth will warn you ofa cat that’s wandered into Tartarus. These stray cats always have Twilight Fragments, so it’s best to track them down when you can. There are alsoblue crystallized shadowsthat occasionally spawn on Tartarus floors. Breaking them will net you a Twilight Fragment as well.
If you’re able to’t get the Ote-gine the first time you reach Floor 143, then don’t worry. The Ote-gine chest won’t disappear since it’s on a Gatekeeper Floor, meaning you’ll have time to gather some Twilight Fragments before your next Tartarus-run.

Where to Use Ote-gine Spear?
Request 65: Bring me an Ote-gine
The Ote-gine is aspearweapon, so it can be equipped byKen. It has the following stats and effects:
200

88
- Critical Rate up (high)
You’ll need to show Elizabeth the Ote-gine weapon to completeRequest 65: Bring me an Ote-gine. This Request will become available on9/10. As a reward for completing Request 65, Elizabeth will give youx1 Quality Nihil Ore.
With the Quality Nihil Ore, you may make the following accessories atMayoido Antiques: