Diyu

"The Ōtsutsuki are perhaps the most evolved species located in the various realms, dimensions and planets. We have traversed planets before humanity discovered fire. During our adventures we started a tradition where claiming a planet for oneself was a symbol of power. Arrive and utilize the planet's Tree to boost one's own might. Some were propelled to godly statuses and used their newfound power to oppress and manipulate the lifeforms on said planet. While others simply wished to to study them. Then there were Ōtsutsuki similar to our parents-your ancestors. They found a hellish planet and decided that Naraka was far to forgiving for one's sins. Instead, they bred the worst beast and created their own hell where thousands suffered. They also utilized eight portals to move freely throughout this nightmarish realm. Well, after they passed it onto us, we decided that this distant planet should be destroyed and forgotten. So we sealed the portals..."

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