This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
讄 combines 言 (speech) with 畾, which likely contributes the sound. The exact historical development is uncertain.
With 言 (speech) on the left and the stacked fields of 畾 on the right, imagine a prayer echoing across many fields, but the meaning is uncertain.
For ル, imagine a whispered prayer that sounds like 'ru' as it travels across the fields: ru -> ル.