Do a search for 'libram'. For the most part they let you enchant head or leg with various things, including +150 mana, +1% chance to dodge, +125 armor, and some other stuff. The quests are not too hard, but they take some dedication to running instances to get the components.
Shoulder enchantments are made possible via raising fame with Argent Dawn.
The reality is however, none of these enchants have little if anything to do with "EndGame Enchanting" as no enchanters or enchanter skill/profession is required. These enchants are applied much like armor kits, and are Bind on pickup.