Although Ye Luo had attacked the ninth tribulation cloud three or four times with his strongest attacks, he still hadn't dispersed it. His Entity Arrows hadn't even managed to collide with the tribulation cloud. His attacks had still affected it to some extent, but breaking through it wouldn't be easy, especially since the ninth tribulation cloud re-formed even faster than the other eight.
The reason even his strongest attacks couldn't directly hit the ninth tribulation cloud wasn't that the lightning it gathered was more powerful. It was also partly because of the eighth tribulation cloud. The area of the eighth cloud above Ling Tian and the others that they had dispersed wasn't very large, so the lightning it gathered could still interfere with Ling Tian's attacks. After being weakened by the eighth cloud, his attacks naturally had little effect against the ninth.
Ling Tian had already used a Merged Entity Arrow formed from nine arrows, combined with his most powerful Seven Consecutive Arrow Strikes. He still had even stronger attacks at his disposal, such as using arrows like the Immortal-Slaying Arrow, or controlling all the surrounding formations to attack. But they were saving those for breaking through the firmament; using them now would be far too casual. In particular, both attacks consumed a great deal of energy and could reveal his trump cards to the Lord of the Universe in advance. The Lord of the Universe had very likely already learned of them, but Ling Tian still clung to a final sliver of hope. He wouldn't use those attacks until the last possible moment.
Ling Tian could still break through the ninth tribulation cloud if he kept attacking, but it would take a long time and consume quite a few Entity Arrows. He still had plenty of them, but he