Operation Room

Operation room (Contract room) is a facility for dealing with contracts.

Combine contracts

Contracts usually have only fixed abilities when obtained.

You can add new abilities to your contracts by paying Dark Study and selecting another contract as a material.

A single contract can have up to 5 abilities.

Name can be set for a contract that has been combined more than once. (You can change the name by touching the name in the possession list)

Salvaging contracts

Unnecessary contracts can be salvaged all at once.

The salvaged parts are converted into Dark Study.