Undergoing trials will greatly increase units’ stats and allow them to acquire new skills, unit types, etc.
Trials can be undergone by using Super Rainbow Trial Certificates, Rainbow Trial Certificates, or unit-specific Trial certificates along with Zeni.
Trial 1: Unlock non-unit type skill(s).
Trial 2: Unlock link skill(s).
Trial 3: Random Active Skill 2, Passive Skill x2.
Trial 4: Unlock sub-gear slot(s).
Trial 5: Unlock active skill 2, passive skill(s).
Trial 6: Unlock unit’s unique passive skill(s).