1. The Mithril trimmed Dwarven armor should be a bit more durable and protective. I mean, you are spending almost an entire Mithril ingot on just one piece.
2. Remnants of the Dwarves: I understand that several people have suggested these before, but I have ideas on how they could be implemented. They would be like (MUCH) smaller versions of Moria. They would spawn in mountains, except the Harad Mountains as those weren't colonized by Dwarves. They would be quite rare(like four or five per world), and would have much loot, but, you have to be careful where you tread. Many have been taken by the Cave Orcs, basically Gundabad Orcs but with only two and a half hearts (the reason why is below). If you make a wrong step, you may find yourself caught in a trap! Or, the denizens may become alerted and swarm you in droves. And I do mean droves! You may find yourself up against twenty at once! Or, you may find that they share their space with a far deadlier creature... sometimes, a Balrog, Dragon (when they're added), or some other foul thing (up to whatever horrifying creatures of the darkness Mevans can dream up), may spawn.
3. Traps: Digging a pit and covering it with camouflage, which would be made simply by putting two sticks and two leaves of any kind in any spots of the crafting table, putting down iron caltrops(four iron, one in each bottom corner, one in the center, and one at the top middle), and even devising poison arrow(made like poison daggers but with an arrow instead) shooting machines, are among the traps thought up by the Cave Orcs.
4. About the Rhun Elves: I feel like they should have a sort of Japanese feel, like, Katana-like swords, Samurai-like armor, rice. This would work well if they'll be living near the mountains, as Japan is a mountainous country.