Location of the Red Heart
The red heart was a big deal to each group for several reasons. First, as for what each group wanted to use the red heart for, it was unknown, but everyone could make educated guesses. In some cases, some groups just wanted the red heart, so others couldn't use it.
The question for the longest time though, was where was this mysterious red heart in the first place? A large red crystal had been dropped after the battle between Hero Quinn and Graham. It was a condensed form of energy from Quinn's awakening powers and the blood of some of the strongest people in the history of the Earth.
It was most likely a once in a lifetime item, one's conditions that would be impossible to replicate and create another. There were those that studied the final fight with Quinn after seeing the red crystal.