Didn't see this in the forums, so if I missed it, all credit goes to original poster and sorry for repost.
You and a group can get rings easy and w/o dying(for the most part). Just need 1 who can fight mp10 ubers rather quickly to beat out NV time limit(and possible enrage timer if it exists).
Directions:
Group runs around and grabs 5 NV stacks.
Start uber boss encounter, after cut scene, 3 leechers leave game NOT party(hit esc>leave game)
Monsters will go back down to original mp10 str and health
Fighting toon kills one at time, then notifies leechers to resume game when last uber is at 10-20% health(this depends on how fast uber is dropping in health, you need time to join back in game BEFORE uber dies)
Leechers will not be able to help finish off boss, but boss is dead, you can port back in to get your ring pieces and loot.
Rinse and repeat!
EXTRA INFO
Works best with Vent so fighter doesn't have to pause fighting to inform leechers to resume.
Leechers do die on occasion when waiting to "leave game" in the 10 second count down, nothing to worry about, you were leaving it anyways. you don't lose your nv stack and come back at full health.
Don't be a fool and try to switch toons while out of game, you'll lose your NV stack.
You need to be able to get back into the game and click fighter's banner before boss is dead. Message should appear "can't join while in boss fight(blah blah)" If boss dies while game is loading, you lose out on loot.
Don't join back too early as ubers will regain str and health based on how many players are actually in game.
MP8+ but MP10 is preferred due to 100% drop rate on ring pieces.