Guide for Keys in Mongil: STAR DIVE. Discover the best way to farm keys, how to use Stardust, and tricks to maximize your Spare Keys and recover stamina!
Table of Contents
Recommended Uses for Keys
List of Recommended Uses and Paths
| Path Name | Priority / Main Drops |
 ▼Path of Fighters, etc. | ★★★★★ Breakthrough Materials |
 ▼Experience Training | ★★★★★ Character EXP |
 ▼Equipment Enhancement Training | ★★★★・ Equipment EXP |
 ▼Artifact Enhancement Training | ★★★★・ Artifact EXP |
 ▼Path of Artifacts | ★★★★・ Artifact Breakthrough |
 ▼Monsterling Enhancement Training | ★★★・・ Monsterling EXP |
 ▼Vault of Greed | ★★★・・ Gold |
 ▼Teaching of Fire, etc. | ★★・・・ Skill Items |
In Mongil Stardive, all activities that consume Keys are located in the Paths screen. When you need to spend stamina, choose the Path that best fits your current team.
Keys Unlocked in Ep. 1
You will unlock your first Stamina-consuming activity, Experience Training, by completing the Episode 1 Side Quest 'The Path to New Experiences'. You can reach this point in about 30 minutes of gameplay.
Always Challenge the Highest Difficulty
No matter what difficulty you choose, the cost of entering a Path is always a flat 10 Keys. Because higher difficulties offer much better rewards for the exact same stamina cost, you should always challenge the highest difficulty you have unlocked.
| Tip! | You won't lose Keys even if you withdraw or fail a Path. Feel free to challenge harder difficulties without worrying about wasting your Stamina! |
Breakthrough Paths
Paths named after specific classes (such as the Path of Fighters) drop Breakthrough materials for that class. Since Breakthrough materials are essential for raising character level caps, this should be one of your top priorities. Be sure to check which class materials your main team needs before farming!
Experience Training
Drops Character EXP materials. Since you need to raise the level of all characters in your party to progress, prioritize this Path whenever you run out of EXP items.
Equipment Enhancement Training
Drops Equipment EXP materials. Enhancing equipment provides a massive stat boost. If you are stuck on a difficult boss, farming this Path to upgrade your gear is usually the best solution.
Artifact Enhancement Training
Artifact Enhancement Training drops Artifact Experience items. Upgrading your Artifacts is the most direct way to increase your Attack Power. This is an extremely high-priority Path, second only to leveling your characters.
Path of Artifacts
The Path of Artifacts drops Breakthrough items specifically for your Artifacts. Farm this Path whenever your Artifacts reach their current level cap.
Monsterling Enhancement Training
Monsterling Enhancement Training helps you level up your equipped Monsterlings. Because the stat increase here is smaller compared to upgrading standard equipment, you should primarily run this Path only after you've obtained a high-tier or powerful Monsterling.
Vault of Greed
The Vault of Greed is specialized for obtaining large amounts of Gold. Gold is required for nearly every enhancement system in the game, so farm this whenever your wallet runs dry!
Teachings of Fire (Element Paths)
Paths named after Elements drop skill‑enhancement items for characters of that Element. Since skill upgrades only affect multipliers, it’s best to save this for later, once your base stats are already high.
How to Restore Keys
- Gain 1 Key every 12 minutes
- Overflow converts to Spare Keys
- Restore instantly using Stardust
- Send and receive Keys daily with friends
- Claim Adventure Level milestone rewards
- Restore 30 Keys using Starlight Crystals
Restore 1 Key Every 12 Minutes
Regular Keys recover at a rate of 1 Key every 12 minutes. The maximum cap is 100 Keys, which means it takes 20 hours to fully recover from 0 to 100.
Overflow Becomes Spare Keys
If your regular Keys reach the cap of 100, the game will automatically begin generating Spare Keys at a slightly slower rate of one every 18 minutes. Spare Keys can be converted back into regular Keys at a 1:1 ratio. This system lets you stockpile up to a week’s worth of overflow stamina.
Restore Using Stardust
| Stardust Rarity | Amount Restored |
| Glimmering Stardust (Blue) | 20 Keys |
| Luminous Stardust (Purple) | 40 Keys |
| Radiant Stardust (Orange) | 60 Keys |
Stardust is a consumable item obtained from events and the Stellar Voyage that instantly restores Keys. The amount restored depends on its rarity.
Send & Receive Keys with Friends
You can send 1 Key to each of your friends every day, to a maximum of 30 friends daily. You can also receive Keys from up to 20 friends per day. Filling up your friends list early is highly recommended so you can maximize your free daily stamina.
Your Own Keys Are Not Consumed
Sending a Key to a friend will not decrease your own stamina pool. Feel free to send them to your friends without worry.
Adventure Level Milestone Rewards
Every time your Adventure Level reaches a multiple of 5 (Lv. 5, 10, 15, etc.), you are rewarded with 25 Keys.
Claim from the Mailbox
Adventure Level milestone rewards are not received automatically upon leveling up. They go straight to your mailbox. Claim them whenever you run out of stamina!
Restore Using Starlight Crystals
You can spend Starlight Crystals to instantly restore 30 Keys. However, the crystal cost increases each time you do this within a single day.
Starlight Crystal Costs for Keys
| Daily Refresh Count | Crystal Cost |
| 1st Time | 35 |
| 2nd Time | 65 |
| 3rd Time | 95 |
| 4th Time | 125 |
| 5th Time | 155 |
Save Starlight Crystals for the Gacha
Because Starlight Crystals are the premium currency used for Gacha summons, free‑to‑play and light‑spending players in Mongil are strongly encouraged to avoid using them on stamina and instead save them entirely for pulling new characters.
