Just like Chen Fei, who is currently struggling with the "Sagali" civilization, the top item on his most urgent needs list is time, isn't it? As long as he gets enough time, with the ability of a One Man Army, he can grow strong enough to destroy the "Sagali" civilization. And this time also includes "longevity," making the logic here a self-consistent perfect loop relationship.
The "Sagali" civilization devours the civilizations of other intelligent species, also massively grabbing souls, thereby obtaining extended longevity, which allows it to have an advantage in this protracted interstellar struggle.
Otherwise, relying solely on the self-propagation and renewal within the species could easily shorten the civilization's growth cycle and lead it into an early decline phase.
