When Barla achieves the critical point of her growth and accumulates enough genetic influence while at the peak of the Body Stage, she'll breakthrough to the 2-Life Stage and at the same time, become a Clansman.
The Boar King's goal in creating a Clan was to revive his race. But even he was aware that no matter how careful he was, the Empyrean Boar race was bound to a life of torture.
Even if he ensured the Empyrean Boars reached maturity without consuming a single Pranic Beast, and as a result, weren't influenced by any external Natures, the moment an Empyrean Boar consumes a Pranic Beast, things would derail quickly.
Voracious Nature influenced the Empyrean Boar to consume other Pranic Beasts. in Sumatra Chronicles, this influenced the Boar King to consume more Empyrean Tusks once the number of Internal Inertial Gravity in his Astral Chart reached fifty.