Decreed adverbs are provided in this article. The words listed here are commonly found along with the verb decreed in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb DECREED.
absolutely, accordingly, actually
constantly, divinely, eternally
expressly, finally, formally
immediately, irrevocably, officially
previously, recently, solemnly
unanimously
Hope this word list had the decreed adverb you were looking for. In addition to adverbs used with decreed, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.