Firstly, I would be really surprised if this hasn't been suggested by somebody, but here goes nothing.
Right now, doing Utumno is...kind of pointless to me. Sure there are a couple of cool items that you can obtain by slaying the monsters, such as the Flame of Udûn and the Chill of Daedelos, some pieces of Utumno Armour or equipment, maybe a mithril nugget, a Balrog Whip if you're really lucky, but... for the most part, the stuff you get from conquering Utumno really isn't worth the risk, if you ask me.
That's why I suggest some unique rewards that one can obtain by leaving Utumno via the portal.
Step into the portal. When you return in Middle-earth, a message will appear on screen (similar to that first shown when entering the realm) saying "you successfully conquered Utumno! Press 'O' to choose a reward" or something along that line. Pressing that button will open up a menu allowing you to choose a reward.
Here's a list of possible rewards. You can choose only one.
Would give you 750-1250 coins in a pouch.
+400-600 alignment to whichever faction you've pledged to.
Charm of Life
2-3 pieces of random equipment of whichever faction you've pledged to. This equipment would have 2-3 very powerful modifiers, i.e. Tier 3 or 4. Additionally, it would be "bound". That means, it would not be dropped if you're slain.
As above, but you'd get 2-3 pieces of armour instead of equipment.
Thanks for reading. This suggestion was somewhat inspired by the rewards obtained in RuneScape by dungeoneering.
21:15, March 10, 2019 (UTC)