Scrolls are a one time use items that you can buy in the shop. Each player has only one slot for scrolls and you cannot stack more than one scroll on top of each others.
The number of scrolls in the shop is shared between the players so not everyone can buy the same scroll at the same time. There are also 3 rare scrolls that have a chance dropping in the shop after each boss fight.
The chance of a rare scroll dropping is dependant on the rank of the last boss fight:
- Rank S = 30%
- Rank A = 20%
- Rank B = 10%
- Rank C = 5%