C97 Time Race
No matter if it was an Innate Sovereign Stage, King Stage, or even a Pre-Emperor Stage, they would all suffer the same kind of pain when cultivating.
Cultivating the Defensive Blade didn't depend on one's talent or cultivation realm, it depended on the strength of one's Dao Seal.
Only those who possessed extraordinary willpower and strength of the Dao Seal could cultivate it to perfection