Unlike succumbing to Phase 6 disintegration, the Crystal will vanish after a Gain Art event. Gain Arts are not a naturally-occurring phenomenon and are triggered by the deliberate manipulation or agitation of a Union’s Crystal.
In XBlaze – Code: Embryo, Sechs triggered Gain Arts by using his Drive on humans that were not suitable to host a Crystal and failed to become Unions. Their bodies had burnt marks, but there was no sight of fire around them.
Izayoi uses her Drive to enter Gain Art mode, which increases her mobility and gives her more offensive options.