En gros ca nous rapelle que les Xel'Naga ont cree les zergs et les protoss pour chercher à continuer leur cycle.
"The xel'naga will not be reborn. Instead, a monstrous and powerful perversion of both protoss and zerg will be set loose upon the universe, and all that we know and cherish will fall in their wake."
- Preserver Zamara(src)
A propos du cycle des Xel'Naga
The xel'naga regularly conducted experiments on other species as part of their life cycle. Two species, one with the "purity of form" and another with the "purity of essence", would merge naturally to create a new iteration of xel'naga. This process had occurred numerous times.