As dath ilan would say it, then, Esta presents his evidence.
"The simplest and largest point here should not be overlooked. Your account is not self-consistent. You have no explanation for how you got here. For that reason alone, your story does not hold together. My memories do hold together; we both encountered an [Outer God]."
"Magic is real. You have seen it with your own eyes. You have become clouds and raced with the winds. The imaginary world of dath ilan is one where, contrary to fact, magic does not exist. Or, if you like, has never been invented, despite dath ilan containing thousands of people supposedly smart enough to discover magic or determine the useful properties of spellsilver. For that reason alone, dath ilan does not hold together as a story."