Life Insurance.

The kind of immortality that Legion-7 created is one where the clones of Legion can resurrect without the help of the void universe or the soul sphere. So in a way, Legion-7 became the foundation of independent resurrection for Legion. They are one step closer to perfection because of it. 

The spiritual connection of paragons was enough to do amongst the clones. Legion-7 was easily able to connect most of the clones. They are already of the same soul so they are all compatible. The only ones that couldn't be added to the network were Legion-3, Legion-4, Legion-6, Legion-8 and Legion-9. The other 4 were successfully insured against death.

If Legion-2 were to die, he would return to life as long as Legion-7 is alive. This was proven to be true when Soverick died a few years ago. The power of a world god utilized across a large distance couldn't kill him, but Ragnarok is on his own because Legion didn't want the demon god detecting their intrusion into the Lumen plane.