I got the impression it was more how the major powers in the Duneverse exerted power than a power source in itself (hence why Mohiam didn't mention it in her little talk).
Source: wiktionary
Duneverse
Synonyms for "duneverse" (1 found)
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Proper Noun(1 words)
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3 total sentences available.
And all the Fans of Dune (the Novel) I know in real life have always agreed with me that the mini-series was much better than the movie in portaying^([sic]) the Duneverse.
Source: wiktionary
Given that all other current-day religions have turned into something unrecognizable in the Duneverse, it does seem a bit odd to have a "Rabbi" running around. But I haven't read the later Frank Herbert books, so it's possible he explained it there.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.