Triversail

The rouges are beasts capable of harvesting,corrupting, eating a soul.A by product of a horrible experiment gone wrong is what they are believed to be.

So of corse there must be someone to take care of these minuses.Thus there are the unknown.They are not meant to get involved with humans and their dimensions but only take care of the worlds they reside.Getting rid of rogues is a number one task.

The firsts are the most powerful family in the unknown world so it's their job to protect the people from great harm as well as humans.They are accompanied by the seconds,thirds,and fourths.They are the top four.
Every 2 million years a unknown in the top four is born with triversal.A disease of the soul,causing it to be split into three.

Her name is la-lu.The original of the three.