Basically rift needs to tweak this method because you can take care of invasions to manipulate it so you get way more rewards than you should.
Requirements:
A build similar to this one: Soul Tree Calculator: Paragon (26) / Riftblade ( / Warlord (0) :: Rift :: ZAM
http://rift.zam.com/en/stc.html?t=0cLuE.Vh.xetczozzNote: Paragon is needed but Riftblade and Warlord aren't needed.
1. Have Paragon Specced into
2. Have the talent "Bend Like a Reed"
3. Have the talent : Path of the Hurricane
Note: You won't be killing monsters for a rift reward. You're killing the invasion monsters spawned from the rifts.
Method Explained:
Go to Scarlet Gorge during an invasion. Depending on your server there many not be enough players to defeat an invasion. After the zone is defeated find a quest hub overrun by monsters that have 5000 hp and are surrounded by 500 hp monsters.
Using the above abilities stack up 3 attack power then pop Bend Like a Reed. Once you're taking no damage from these monsters spam "Path of the Hurricane"
By "Path of the Hurricane" should kill the monsters in about 2 hits (assuming 250 dmg per use).
Kill the 5000 hp monsters, using potions or other items if needed. Take this slowly but fast enough as to kill the monsters before they despawn.
Because of the massive AOE damage and your contribution in the fight you should be rewarded with a lot of rewards.
Rewards: I was reward with the entire stone vanguard artifact set and 7 shifting puresource.
Other Uses: If there is any other invasion in another zone with low HP monsters surrounding one big one then apply this method and it should more or less work.