Recruit Selene quest guide has been updated.

DR 29-32 Recipes

It seems GE v3.x has introduced recipes for the higher-end armors. Leather Armor Crystals are refined from Leather armors of the specified grade (DR). So, Elite Le Noir requires the destruction of 2 Elite Le Blanc to get the required Grade 30 Leather Armor Crystals. The refinement is available in Errac. Ambrosia, aka Liquid of Heaven, is a cash shop item. (Le Noir is renamed as Le Rouge in SNW. Senseless renames FTL.)

On an off-topic note, in less than 2 weeks after the release of v3.0, there are already Sexpert Selva in SGE... D:

Source - LN RecipeSexperted Selva