 ==Borealis== Yes, de borealis sol is ungrammatical; but I think you are prescribing more than Latin does: the ablative of i-stems is variable; compare turris/turre. Also, while I cannot think of a compact way to put this (or I would have) the intention of the anagrammatist may be to use borealis, correctly, as a genitive (although there is also the dreadful possibility that this is dictionary-Latin, ignoring inflexions entirely).  