A commission by the lovely @izuchant ! It's a scene from my fanfiction Nexus of Time - Alternate Ending :D Instead of Goku Black, it's Gohan Black >D Gohan's "SSJ Blue" State is purple, because he has been training with Kaioshin :D Scene depicted is this:
The sheer explosiveness of Chibi’s power knocked Trunks off of his feet, and he was blown back before he could regain his bearings— Despite the numerous injuries, Father was laughing. Laughing. There was no doubt in Trunks’ mind, now, that Father had purposely provoked Black— As the air around them finally settled, Trunks looked over in awe, completely flabbergasted at the energy pouring out of Chibi— Chibi… once again you have surpassed my expectations— Black – he, too, was in disbelief at just the level of power contained within Chibi. Yet another comparison to Cell, Trunks noted— When the dust finally settled Trunks noticed that Chibi had turned purple— Wait. What? “...You—” Black’s eyes narrowed. “Purple?” Then he brought his hand up to his forehead and laughed hysterically. “Purple?! How dare you— Heresy! Sacrilege! A desecration of all that is divine! You are mortal, Son Gohan. A mortal—” “Actually, it’s called Amethyst, Zamasu.” “I will smite the abomination that is your soul from all of existence!”