"Requiem of Desolation: Lightning Phantom!"
As soon as the words were heard, the mana inside the dome turned into substance as it condensed above the siblings.
Pink thunder and cyan phantom energy started taking shape in front of everyone's eyes as they slowly, yet strangely fast, turned into a giant phantom above the siblings heads.
The demons who were present could not help but widen their mouths in surprise, and those who just got there were even worse.
The giant phantom resembled a simple humanoid upper body that looked muscular and tougher than rock.
Its vaguely transparent phantom skin was dark cyan in colour, however, everyone could see the dangerous pink lightning arcs swirling within, giving them goosebumps.
The giant phantom looked as though a magic thunderstorm had taken form. And although it didn't specifically have a lower body, it had a ghostly tail that was connected back to the siblings' shadows.
:)