In his eyes, Desert Rose wasn't the most important thing.
Clarifying the Black Poison Qi and having more ways to deal with the Black Death Blade King was key.
He couldn't possibly ignore those stronger than him and waste time on those weaker than himself, could he?
Shen Wang quickly sold the prepared talismans and then bought the first two layers of the Dragon-Suppressing Force cultivation technique. The third layer was much more mysterious and only available through the Buddhist Sect.
After all, this body refining technique was quite commonplace, difficult to cultivate, and progressed slowly. Generally, individuals with better techniques wouldn't choose it, and releasing two layers was enough.
The reason Shen Wang chose this technique was that the Dragon-Suppressing Force had a high upper limit, was easy to acquire, and didn't require frequent changes of body refining techniques.