As for why Windermereans were so short-lived, that was due to Primal Civilization.
The Windermereans had actually been created by the Primal Civilization as specialized tools to deal with the Primal Demons: [Star Singers].
The role of these [Star Singers] was to consume their own Soul Life as energy, using song as a medium to produce Soul Attacks.
The reason the Primal Demons had previously been sealed away...
Was that the Primal Civilization had treated these [Star Singers] as consumables, using an entire Spherical Star Cluster Galaxy as the core to create a Star Singer System with an immense Galactic Wind Domain.
Then, through Wind Songs that burned Soul Life, they spread and radiated Fold Waves of Soul-Spirit Energy throughout the entire galaxy, using the whole Spherical Star Cluster Galaxy as a trap to capture the Primal Demons.
After trapping them, they continuously depleted the energy within their bodies, forcing them into a dormant state of self-preservation.
Only then were the Primal Demons temporarily sealed away.
Therefore, as half a Primal Demon himself, he naturally had to take this seriously.
Otherwise, one day he might inexplicably end up trapped inside a star system without even knowing why.
The greatest strengths required of consumables were short growth cycles and strong reproductive ability.
Because of this, although Windermereans had powerful bodies, their aging cycle was also extremely brief. Most did not live past thirty.
If they made heavy use of their Soul Life, their lifespan would shorten even faster.
Like that anglerfish-faced female lead, [Freya Veen] from the "Valkyrie" tactical music group—she had overdrawn her Soul Life through singing and died just after turning fifteen.
Thus, improving their lifespan was the best entry point. Then he could assimilate and modify their entire race, bringing them all under his control.
Compared to exterminating