"This is where you want to do it?" Onyx was pretty dedicated to seeing how things would turn out with the Amarok eggs that they had gathered in a dormant state.
While it had been some hour before Walker, Mordant, and he had left those ruins with the two remaining ruin hunters, it still had been even longer to get home.
While Mordant could easily use more dark mana, he was still influenced by something nearby. It had made things difficult for him and left the ruins as something sealed off by Walker before they had begun to leave.
As they had assured each other that the reason they were not delving in to this was that they wished to bring the two serpents who needed better resting conditions back, they all made a clear promise to go back sooner rather than later.