Chest keys in MementoMori unlock sealed chests, which will give you useful items for your playthrough. Read on to find out where you can get chest keys, as well as what items you can get once you unlock sealed chests!

Chest Keys Guide

Collect Chest Keys From Daily Missions, Events

The first way to get chest keys is to complete Daily Missions, which give out Bronze, Silver, and Gold Chest Keys as you complete more of them. Sometimes, some events also give out chest keys as rewards.

Buy Chest Keys From the Shop

If you want even more Chest Keys, another way to get them is to buy Sealed Key Gifts from the Special Shop. These are sold for 1,560 Diamonds and contain 10 Bronze Keys, 20 Silver Keys, 50 Gold Keys, 16 Tickets of Infinity, and 1 Kindling Orb equivalent to an hour's worth of auto battles.

You can also buy keys through the Battle Coins section of the shop, where keys are sold in packs of 5. Bronze Keys cost 1,300 Battle Coins, Silver Keys cost 2,500 Battle Coins, and Gold Keys cost 5,000 Battle Coins.

How to Collect and Use Battle Coins

Use Chest Keys in the Item Box

To use Chest Keys, simply go to the 'Consumables' tab in your Item Box. Make sure you have the corresponding chest for the key you're going to use. Once you've selected your key (or the Sealed Chest), decide how many chests you'll open.

You will then get a random reward, which is drawn from a pool of potential items that change depending on what chest you're opening.

Sealed Chest Item Rates

Bronze Sealed Chest Item Rates

Click to See Full List

Item	Rate
Upgrade Water x 20	10.0000%
Upgrade Water x 40	10.0000%
Dark Perfume x 1	15.0000%
Mystery Rune Lv. 1 (x 1)	8.0000%
Mystery Rune Lv. 2 (x 1)	10.0000%
Mystery Rune Lv. 3 (x 1)	5.0000%
Boss Ticket x 1	5.0000%
Gold x 10000	14.0000%
Gold x 20000	9.000%
Silver Sealed Chest x 1	5.0000%
Silver Key x 1	5.0000%
EXP Orb (1 hr) x 1	4.0000%

Silver Sealed Chest Item Rates

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Item	Rate
Upgrade Water x 60	10.0000%
Upgrade Water x 100	4.0000%
Dark Perfume x 2	15.0000%
Mystery Rune (Lv 2) x 1	6.0000%
Mystery Rune (Lv 3) x 1	7.0000%
Mystery Rune (Lv 4) x 1	3.0000%
Rune Ticket x 10	10.0000%
Rune Ticket x 15	5.0000%
Boss Ticket x 1	6.0000%
Ticket of Infinity x 1	8.0000%
Gold x 20,000	10.0000%
Gold x 40,000	5.0000%
Gold Sealed Chest x 1	3.0000%
Gold Key x 1	3.0000%
EXP Orb (1 hr) x 1	5.0000%

Gold Sealed Chest Item Rates

Click to See Full List

Item	Rate
Upgrade Water x 100	15.0000%
Upgrade Water x 200	5.0000%
Dark Perfume x 3	15.0000%
Mystery Rune (Lv 4) x 1	10.0000%
Mystery Rune (Lv 5) x 1	3.0000%
Mystery Rune (Lv 6) x 1	1.0000%
Rune Ticket x 20	10.0000%
Rune Ticket x 30	5.0000%
Boss Ticket x 1	7.0000%
Ticket of Infinity x 1	10.0000%
Gold x 100,000	8.0000%
Gold x 200,000	5.0000%
EXP Orb (1 hr) x 1	5.0000%
EXP Orb (2 hrs) x 1	1.0000%

MementoMori Related Guides

List of All Tips and Tricks

All Tips and Tricks Guides

Beginners' Guide
Beginner's Guide
The Best World To Play In for Beginners	Reroll Guide
Team Building Guide	How to Clear the Cave of Space-Time Trial
Who to Pull Using Witch's Invitation	Tower of Infinity Guide
Fountain of Prayers Guide	Temple of Illusions Guide
Guild Guide	Battle League PvP Guide
Gear Guide	How to Augment Gear
Rune Guide	Awakening Guide
Level Link System Guide	What Is the Invocation of Chance?
Which Gacha Gear Set Should You Build?	Unique Weapons Guide
Gold Farming Guide	Tree of Life's Dew Explained