Items and materials
Updated 16 Oct 2026
All your items are under Menu > Items. You can hold up to 999,999 of each.
Stat crystals
Used in the Attribute Matrix. Each stat has three grades: Shard (common), Crystal and Holy Crystal (rare).
| Stat | Shard | Crystal | Holy Crystal | Weekday quest |
|---|---|---|---|---|
| HP |  |  |  | Thursday |
| MP |  |  |  | Wednesday |
| Attack |  |  |  | Tuesday |
| Defense |  |  |  | Monday |
| Critical |  |  |  | Saturday |
| Skill |  |  |  | Friday |
Hacking Crystals
Raise a unit's level cap with a limit break.
| Item | Use | Where from |
|---|---|---|
 Holy Hacking Crystal | Limit breaks for ★2 to ★5 units (once for a ★6) | Duplicate ★2 to ★5 units from scouts |
 Sacred Hacking Crystal | Limit breaks for ★6 units of that element (one kind per element) | Duplicate ★6 units, events |
 Almighty Sacred Hacking Crystal | Limit breaks for any ★6 unit | Events |
Some event and special units have their own Hacking Crystals instead.
EXP and boosts
| Item | Use |
|---|---|
 EXP Potion | Small amount of EXP for one unit |
 EXP Hi-Potion | Medium amount of EXP |
 EXP X-Potion | Large amount of EXP |
 EXP Boost (2x) | More EXP from one quest. Use up to four at once on the party screen |
 Col & Item Boost | More Col and stat crystals (Shards, Crystals and Holy Crystals) from one quest. Up to four at once |
Boosts are used up when the quest starts, even if you give up. EXP Potions come mostly from Urgent Quests (Extra Quests); boosts come from the login bonus.
Boosts are not open yet on MD:Rebirth. Showing your new item totals when you receive items is not open yet either.
Decryption Keys
Open each ring of the Attribute Matrix. The key's level must match the ring. Where to find each one is in the story guide.
 |  |  |  |  |  |  |  |  |
|---|---|---|---|---|---|---|---|---|
| Lv. 10 | Lv. 20 | Lv. 30 | Lv. 40 | Lv. 50 | Lv. 60 | Lv. 70 | Lv. 80 | Lv. 90 |
Evolution Ingots
Used at the Blacksmith in place of a duplicate when evolving equipment.
| Item | Evolves |
|---|---|
 Iron Ingot | ★2 equipment |
 Gold Ingot | ★3 equipment |
 Platinum Ingot | ★4 equipment |
Skill slot materials
| Item | Use |
|---|---|
       Element medallions | Unlock skill slots |
  Banner medallions | Skill slots of the units from one banner only |
 Rainbow Essence | A rarer skill slot material |
Exchange items
| Item | Use |
|---|---|
 Stardust (Small) | Traded at the Exchange Shop (Menu > Exchange Shop) |
 Stardust (Medium) | Traded at the Exchange Shop for medallions, Rainbow Essence and more |
 Memory Fragment | Traded for ★5 upgradable equipment and limited ★4 weapons |
Events have their own exchange items, such as chocolates or tickets, traded in that event's shop while it runs.
Col
Col is the everyday currency, earned from every quest and spent at the Blacksmith. See Memory Diamonds, Col and the Gift Box.