User blog comment:Trihexa/Top 10 Most Powerful Beings In The World (Unofficial)/@comment-85.1.62.158-20170310003239/@comment-29963364-20170310090206

You need to consider the fact that the Biblical God (I'm just gonna call him God) didn't have what Rossweisse had:

The 616 Formula.

God found the sleeping 666 by chance, and immediately recognized that it was a creature far too powerfull to face, even with the combined forces of the Three Factions (considering it took that much just to deal with the Two Heavenly Dragons). So God used thousands of magic seals, including several forbidden ones, just to keep it from waking up.

As was mentioned during Vali's fight against Azi Dahaka, "forbidden" spells are spells that are so powerful/effective that they require a "price." Even healing spells that could regenerate limbs or organs would require you to sacrifice some of your own life, or that of another (like an animal sacrifice). This is why God was in such a weakened state after sealing 666. He didn't just use up a lot of his magic power, large portions of his life-force and/or soul were probably sacrificed as well.

As for Rossweisse, she had plenty of time (years, in fact) to study the beast, and write a thesis during her shool days. And during the events of the story, she picked her research up again, and after a few months, created a formula that could counter the very concept of 666. Similar to when she created an Artificial Space in which Mass-Produced Evil Dragons were rendered useless (refer to DxD Team vs. Walburga in vol. 19).

What God and Rossweisse did were both impressive, but for different reasons.


 * God: Capable of using THOUSANDS of seals, including forbidden ones, to seal away a sleeping 666. All on the spot.


 * Rossweisse: Studied and theorized a Magic Formula to create a sealing spell tailor-made specifically for an awakened  666. All in the span of months (years if you count the time to write her thesis).

So I guess which one is more impressive depends on your personal values & standards.