Hiei’s Dragon of the Darkness Flame (Yu Yu Hakusho)
This is one of the most interesting attacks that I’ve seen in anime. It is the literally summoning of black flames from the depths of demon world itself. Hiei uses his own spirit energy as a lure. It could be as basic as just an energy wave that can disintegrate people against a wall to something that can fly around a stadium murdering people as it heads for its target in the form of a dragon. It’s cool and flashy and everything. A not as powerful demon needs to sacrifice a limb or something to something like a sword handle to summon it. A much more powerful one only needs their energy because they have the energy to summon without a sacrifice. Consumption is also possible with terrifying results for the nearby victim.