This was unmistakably a tribulation for his Unification!
But the issue was that he had not actively triggered the Heavenly Tribulation for Unification. Wait, there was no change in his Dantian, this was not his Unification Tribulation after all, but his Void Refining Tribulation...
Logically speaking, every small realm breakthrough in Void Refining required overcoming a Heavenly Tribulation.
However, since his breakthrough in the first small realm, he had not encountered any Heavenly Tribulations, and now, this Heavenly Tribulation was a culmination of all the small realm tribulations in Void Refining!
It seemed that Heavenly Dao also believed that the Heavenly Tribulations for small realm breakthroughs couldn't kill him, and slashing at him was a waste. Might as well gather them all together and strike with full force to kill him!
"Good grief..."