The Puffball Collective is a Marvel Comics villain, and an enemy of the Hulk.
Puffbal Collective is nothing but a living cloud.
Puffball Collective was once part of a greater worldwide Collective. The small faction of the greater Collective that was known as the Puffball Collective, was secretly studied arcane magic. The Puffball Collective used this magic to summon a large army of demons called the N'Garai. The N'Garai demons quickly started killing the worldwide Collective and destroying the planet. When the worldwide Collective eventually discovered that the Puffball Collective was the one responsible for summoning the N'Garai demons. So the worldwide Collective decided to exile the Puffball Collective to the Crossroads instead of killing it, in order for their species to survive.