The 33 Hells!
The place Meng Hao planned to go was none other than... the 33 Hells!
After the 1st Heaven descended and the Mountain and Sea Realm exploded into war, he came to the realization that the Paragon's blood in his Dao Fruit was boiling. That also gave him the sensation that his cultivation base, his enlightenment, his everything... was on the verge of advancing by leaps and bounds!
Actually, that feeling wasn't limited to just him. All of the cultivators of the Mountain and Sea Realm felt the same thing. It was as if... the arrival of war prompted the Mountain and Sea Realm... to unleash years of reserves which had been built up for the purpose of empowering its people.
However, that also caused Meng Hao's heart to sink. He well knew that the fact the Mountain and Sea Realm was doing this meant... this war would be extremely difficult.