Great Grandmaster, top Great Grandmaster, National Guardian Level (Dynasty's Master of Destiny), Breakthrough Level warriors.
Four levels, from weak to strong.
Wang Sheng's strength was that of the most top-tier Breakthrough Level warrior.
However, this world clearly wasn't limited to just him; the first dynasty's Master of Destiny was also a Breakthrough Level warrior and had likely lived for 2000 years. Furthermore, he was very likely to have emerged from mountains of corpses and seas of blood, so it's quite possible that his strength was even stronger than Wang Sheng's.
This was pressure for Wang Sheng.
One should know that both National Guardian Level and Breakthrough Level are fundamentally Masters of Destiny, except Breakthrough Level has some particularities.
This means that the first dynasty's Breakthrough Level could very well be linked to an existence like the "Heavenly Father", and might even be the "Heavenly Father" himself.