Wallace was silent after receiving the mission as he clearly understood what the Pathfinder wanted him to accomplish.
A Celestial Fragment was now in his possession and this item could either help him learn Chasm Trample or Astral Core Formulation. Unfortunately, the fragment was not enough to complete the learning process. It is only capable of triggering the method to learn the skill. For Chasm Trample, he still needed to be in a special place to fully learn it while the Astral Core requires four other types of immensely powerful energy so he could form the core.
That's right, aside from the power coming from the fragment, he planned to use thermal energy, mana force, nuclear energy, and aether force.