Those hastily ascended new gods were particularly vulnerable because they held First-Level Divinity, which had an extremely low tolerance for error.
If one simply wanted to consolidate a Level 1 Divine Position, Darama could have done it when she destroyed the Divine Root initially. Achieving First-Level Divinity was not easy yet not too difficult—it required ten thousand devout believers willing to endorse you as their Main God. Including casual believers was possible, but ten, or even dozens, or hundreds of them might not equate to one devout believer, depending greatly on the extent of their casual faith.
The God of Strategy already had a certain base of believers, and at the time, Darama had a population of more than a hundred thousand. Even if only a few percent converted, it was sufficient for Lady Strategy to benefit substantially.