I gotta go to work, so I'm just going to drop this here before I forget it... but do we know when Direnni fell? Do we know when Trinimac became Malacath? Are the two events anywhere near each other? Because I can't help but wonder if, perhaps, Direnni kept Trinimac as their chief deity. Then when "Trinimac" suddenly started talking nonsense, most of the elves piously believed in spite of their confusion... and became Orcs for their trouble when Boethiah's deception was revealed. Others, wiser than their bretheren, took refuge among the Men of High Rock, intermarried heavily, producing Breton stock.

Trinimac fell during the Late Middle Merethic Era, several hundred years before 1E1.

The Direnni lose control to High Rock several years after 1E482.