Each Collection can be unlocked by collecting a set number of shards.
The number of shards required depends on its rarity.
R 20 shards
SR 40 shards
UR 60 shards
LR 60 shards
Only one copy of each Collection can be unlocked. All additional copies are converted to shards.
After a Collection is unlocked, its shards can be used for evolution.
*Collection rarity cannot be increased.