Rift

A Rift is a powerful portal that is opened when universes approach one another. Rifts enable a person or object to warp between universes, although if conditions are right the rift may be extremely dangerous. Sometimes, rifts may become so large that they collapse upon themselves. Collapsed rifts may create a corrupted area in which the very fabric of space-time is endangered.

History
The first rift was supposedly created when the Hero Factory universe began drifting towards the Bionicle universe. Heroes began passing through the rifts, exploring the strange world that suddenly appeared. The Matoran and Toa offered a peace treaty, but it took months before they eventually accepted. More rifts began opening after the Technic universe began its collision course. This opened the possibility for new advances in technology, so both Heroes and Toa began using the machinery to their advantage. New vehicles and weapons were created, which significantly improved the lifestyle of the Bionicle. However, their time of happiness would end soon. Along with the Technic universe approaching, the Minifigure universe was not far behind. The small, curious minifigures began crossing through the rifts, and they saw the Bionicle and Hero Factory inhabitants potentially dangerous. They issued their first attack, only to have their entire military forces completely obliterated. This didn't stop them from receiving new technology samples. They began building very powerful mechs to combat their forces, and even today they still fight to the death.

Other Information
The Rifts are a very intruiging object, and very few have been able to learn much about these strange phenomenons. There is a tale of a legendary key-shaped weapon that has the ability to close and open rifts, and many are striving to find this weapon of great power. The Toa and the Heroes want to close the rifts, whilst the minifigures are after the weapon to enslave the inhabitants of the Bionicle and Hero Factory universes.