There were uncountable layers of the Abyss, an infinite cosmos of damnation, and among them, many unconquered ones. These were Vorenza's true objective. But to reach a layer such as this, a pristine unclaimed domain without risking her very own being, a steep price was demanded. Given her current, formidable strength as a sixth tier demon, the Abyss required a sixth-tier soul as payment to get her safely to an unconquered Abyssal layer.
Of course, she could try and travel without paying the price, but that was bound to condemning herself to death. The chaotic currents between layers, the raw, untamed energies, would tear apart any unwarded traveler. Moreover, no established Abyssal Lord would tolerate someone who so brazenly aimed for their seat to simply walk freely within their realm. Such an uninvited guest would be crushed, their ambition extinguished before it could even ignite.