In order to evolve a Valkyrie's Battlesuit from 
-> 
-> 
-> 
-> 
rank, you need to use Fragments (occasionally called Souls) gained though various methods.
Evolving Battlesuits
To go up in rank, you simply need the required amount of Fragments. Then go to the Valkyrja menu from the Bridge, select the Battlesuit, and tap the banner on the left that shows their current rank and level. On the right you will get the option to "Evolve" if you have enough Fragments, or you can see how many Fragments you currently have towards the total needed.
Evolution, Unlock, and Conversion Amounts
Evolution is the amount of Fragments required to Evolve a Battlesuit up to the next rank, for example, Evolving a Standard B-rank to A-rank requires 20 fragments.
Unlock is the amount of Fragments required to unlock the Battlesuit if you have not already unlocked their card through a supply.
Conversion Amount is how many Fragments are given when a Battlesuit you already have unlocked is drawn in a supply.
| Evolve Req | B -> A Rank | A -> S Rank | S -> SS Rank | SS -> SSS Rank |
|---|---|---|---|---|
| Standard | 20 | 50 | 100 | 200 |
| Awakening | 60 | 250 | 600 | |
| SP | 60 | 200 | 400 |
| Unlock Req | B rank | A Rank | S Rank |
|---|---|---|---|
| Standard | 10 | 30 | 80 |
| Awakening | 40 | 100 | |
| SP | 40 |
| Conversion Amount | B rank | A Rank | S Rank |
|---|---|---|---|
| Standard | 7 | 18 | 30 |
| Awakening | 30 | 70 | |
| SP | 30 |
Farming Fragments
Fragments for every unawakened B and A-rank Battlesuit (also including Wolf's Dawn) are available in multiple places, including:
Standard Supply(no longer available as of Version 3.6)Story stage farming locations(fragment farm stages are moved in Expedition section in Version 4.5)- Dorm Supply (replaced Standard Supply, can drop some awakened Battlesuits)
- Occasionally, A-rank Battlesuits can also appear in the Battlesuit Supply
- Sakura Samsara, Schicksal HQ and A Post-Honkai Odyssey’s Adventure Tasks rewards
- Expedition stages (can be done from Dorm's Expeditions section to save time)
- Armada Warehouse for
Ranger Reputation and Coins (refreshes daily) - Various shops, such as;
- Logistics Terminal for Coins, Asterite or Crystals (rotates daily)
- Witch's Corridor for Witch Orbs
- Asterite Shop for Asterite (A-rank Battlesuits only)
- Dorm Shop for Work Points Cards (A-rank Battlesuits only)
- Elysian Shop for Rusted Insignia (A-rank Battlesuits only)
On the other hand, S-rank Battlesuit Fragments are more difficult to get. They must either be pulled from Dorm Supply. specific Battlesuit Supplies, or from 
War Treasury. Please consult the table below for specific locations for upgrade Fragments for each Battlesuit.
