Levels, the Attribute Matrix and Decryption Keys
Updated 16 Oct 2026
A unit grows in two ways: levels raise its base stats, and the Attribute Matrix adds bonus stats, skills and more on top.
Character level
Units gain EXP from every quest they clear in. You can also feed them EXP Potions from Menu > Items:
| Potion | EXP |
|---|---|
| EXP Potion | Small |
| EXP Hi-Potion | Medium |
| EXP X-Potion | Large |
Urgent Quests with Ragout Rabbits are the classic place to farm potions; see Extra Quests. EXP Boosts, used on the party screen before a quest, raise the EXP from that quest (up to four at once). Boosts are not open yet on MD:Rebirth.
Each rarity has a maximum level:
| Rarity | Max level |
|---|---|
| ★1 | 50 |
| ★2 | 60 |
| ★3 | 70 |
| ★4, ★5, ★6 | 80, then up to 100 with limit breaks |
The Attribute Matrix
Open a unit and tap Unlock Attributes (the Attribute Matrix). It is a web of nodes that branches out from the centre. Each node raises one stat (HP, MP, ATK, DEF, CRIT, Skill and more) and costs crystals of that stat:
| Rarity | Crystal | Where it drops |
|---|---|---|
| Common | Shard | Almost every quest |
| Uncommon | Crystal | Later story chapters, weekday quests |
| Rare | Holy Crystal | The latest story chapters, higher weekday difficulties, events |
There is one set for each stat: HP, MP, Attack, Defense, Critical and Skill. The weekday quests each drop one stat; see the schedule in Your daily routine.
To unlock a node you need:
- the unit at the node's level or higher,
- the node next to it already unlocked,
- the crystals it asks for,
- for each new ring, a Decryption Key of that level.
Maxing one branch of a unit from level 1 to 80 can take as much as 232 Shards, 142 Crystals and 42 Holy Crystals of that branch's type. Many units need fewer. Spread your crystals over the units you actually use.
Unlocking attributes on event units also reveals their character story.
Decryption Keys
Keys come in levels 10 to 90. A key opens the ring of nodes of the same level, and can only be used when the unit has reached that level.
| Key | Where to find it |
|---|---|
| Lv. 10 to Lv. 60 | Story battles; see the key farming table |
| Lv. 70 | Treasure chests in story chapter 11 onward, the user rank 15 mission |
| Lv. 80 | Treasure chests in story chapter 12 onward, the user rank 20 mission |
| Lv. 90 | Events and the Exchange Shop |
On MD:Rebirth the Exchange Shop can also trade Stardust for keys, and events give keys as point rewards. These trades may change as more original data is found.
Event units and Event Crystals
★4 units earned from character events are trained with that event's own Event Crystals instead of normal Hacking Crystals. Event Crystals only drop in that event, so collect them while it runs. Levelling works as for any other unit.
Using Memory Diamonds
In the original game, when you were a few crystals short, you could pay the rest in Memory Diamonds. It is rarely worth it: crystals are easy to farm and diamonds are better spent on scouts. This option is not open yet on MD:Rebirth.