Orvanians always stressed to the seven intergalactic power that they were not a peacekeeper and they would not interfere even if the whole Omniverse went into war as long as they did not meddle in the matters of the Orvanians
They are doing their penance as decreed by the creator.
They only guarded the multiversal connection and would interfere in matter where such cases of multiversal problem is to be found.
As one of the most advanced and smartest being in multiversal technology, they were the only one that is equipped to handle such a massive problem.
Other than the Time Lords
But just because they did not act like a peacekeeper of the Omniverse, when they have to fight something that is considered as an obstacle to the repairing of the Multiverse, they would not hesitate to show that they are not all bark and no bite.
So, they were ready to descend down to Earth.
