With the ghost king ship in the lead, the fleet headed straight for the seven night mountain. All the warships had phantoms of wild beasts on them. After the Phantoms appeared, the real bodies of the warships could no longer be seen clearly. Then, the warships opened fire at the same time, shooting out energy beams. The energy beams they shot out were not black, which meant that the energy source of their weapons this time was not the black crystal.
The reason why Zhao Hai did not let them use the black crystal as an energy source was because it was the power of destruction. The power of destruction had a huge effect on the plants. If they used the black crystal as an energy source, there would not be many plants left on seven nights mountain after the war. It would also be very difficult for the plants to recover. Hence, Zhao Hai did not do so. He only let them use ordinary abilities.
