You guys finally got it right. There's only one problem. This only affects Nyzul Isle Uncharted Region.Players who defeat the NMs that spawn on floors 20, 40, 60, 80, and 100 five times will be rewarded with a key item corresponding to that section.
Talking to the NPC Berangere at Aht Urhgan Whitegate (L-9) while in possession of one of those key items will allow players to receive one piece of equipment from a list of possible spoils obtainable in that section.
In the name of 0/100 NM campers/event repeaters everywhere, add this to EVERY EVENT in the game!!! While you're at it, add it to NMs and HNMs too.
Sincerely,
Everyone who's ever gotten their butt kicked by the Random Number Generator
Edit: By the way- No, I don't mean "repeat anything 5 times, get the reward." The number of repeats would be set for each content relative to the amount of time they expect players to spend before succeeding with the RNG.