Bungie, I think you should create 3 platinum chests per location. These chests would contain notes that get decrypted at the Cryptarch, to decrypt them though, you'd need all 3 notes from the planet.
To fully decrypt the notes, Rahool would need 30 rare engrams and 5 legendary/exotic engrams. (Exotic allows you to use Xür for an eventual way out.)
After decrypting the notes they'd turn into "Platinum Bounties" which is just an extremely hard exotic bounty.
Each of these bounties would grant an extremely powerful weapon, and the bounty would be specific to the weapon. These weapons would only display these outstanding abilities in PvE, as to avoid complaints about PvP death.
These exotic bounties would be on par with the difficulty of hard mode raid, and have similar requirements such as the exotic bounty that makes you do Epic level 26 Phogoth strike. Though the requirements for the Platinum Bounties will be PvE based so as not to anger people who just aren't good at PvP.
The platinum bounties I have in mind are still under development and will be posted later, for now, I will post the Weapon Names and their unique abilities.
Earth Bounty
"Core of Earth" Exotic AR.
"Volcano Burst" is a special ability that makes all rounds blow up (small blast radius) on contact.
Does Solar Damage
Moon Bounty
"Lunar Crater" Exotic RL
"Eclipse Impact" is a special ability that let's all ammo be held in the magazine. 6 rockets total? All 6 can be loaded an fired in semi-auto without reload.
Does Void Damage
Venus Bounty
"Terminal Circuit" Exotic SR (Sniper)
"Circuit EMP" is special ability that let's this gun do arc damage along with it's normal damage and also temporarily paralyzes non-boss enemies hit with this weapon.
Void Damage
Mars Bounty
"Blood Rover" Exotic PR
"Rover's Revenge" is a special ability that let's you deal triple damage to any enemy with a shield, no matter what type it is, and electrocutes the enemy, doing arc damage over time.
Arc Damage
Now as for issues with the chests, such as exploitation, here's the ideas.
The idea is that there are 3 chest on every planet, and these three chest will spawn in different locations for different players. For each planet, there will be about 9-12 locations where these 3 chest could spawn, as to avoid instant leakage of locations. Even when they do get leaked, the bounties afterwards make them work hard so they can earn their weapon.
To prevent further exploitation, the platinum chests would be linked to accounts, like the ghosts are, instead of being linked to characters.
Finding these chest is a one time thing. Possible further preventives to make this harder is after you acquire the bounty, you will have a week to finish the bounty before it disappears and you have to hunt down the chests in NEW locations.
(Anyways, DeeJ, I know many possible locations for this if needed if you decide to implement this.)
Edit: Typos
Second Edit: Update
Additional Credits: laxxman7
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Why not.