This covers Sanity consumption and how to use stamina in Arknights: Endfield. It explains how to spend stamina, how to recover Sanity, and how to increase the cap.
Table of Contents
How to Spend Sanity
Sanity is Stamina Consumed in Protocol Spaces

In Endfield, Sanity is a stamina element consumed in places like the Protocol Space. After clearing a stage, you can spend a specified amount of Sanity to obtain character enhancement materials and other items.
Unlock by Progressing the Story
The Protocol Space is unlocked by progressing to "Building an Outpost" in Chapter 1. You cannot use Sanity until it's unlocked, so prioritize progressing the story in the early game.
Sanity Usage Permits

By using a "Sanity Usage Permit," available from the Pass or event rewards, you can double the stamina consumed and rewards gained. This is recommended when you want to spend stamina quickly and efficiently.
How to Recover Sanity
Recover Over Time

Sanity recovers over time, at a rate of 1 per 7 minutes and 12 seconds, or 200 per 24 hours. It will not recover beyond the cap, so be sure to spend it before it's full.
Recover Using Sanity Recovery Items

| Item | Effect |
| Sanity Syrup | An item that recovers 40 Sanity. |
| Emergency Sanity Booster | An item that recovers 40 Sanity. Expires in 10 days. |
| Strawberry Crepe | An item that recovers 40 Sanity. |
You can also recover Sanity by consuming Sanity recovery items. Emergency Sanity Boosters have a short expiration of 10 days, so prioritize using them.
Recover Using Origeometry

You can also use Origeometry to recover 40 Sanity. However, Origeometry is a rare item that can be used for things like exchanging for Oroberyl (Gacha Currency), so be careful not to use too much and run out for headhunting.
Using Origeometry Raises the Cost

You can use Origeometry to recover Sanity up to 10 times a day. However, the more you use it in a single day, the more Origeometry it will cost, so check your inventory and use it wisely.
How to Increase the Sanity Cap
Increases Authority Level

The Sanity cap increases as your Authority Level rises. Earn experience by clearing Protocol Spaces and Energy Alluvium in your daily gameplay to raise your Authority Level.
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