Now before you all cry REPOST, this does not use any player-based kings buffs. It may be a bit of a spinoff of the existing 350AP buff which stacks with player might/shouts, but normally when you get a player's kings, it'll overwrite the kings buff you gain from the NPC. This is a stacking 10% + 8% kings, complete with screenshots. First, make sure you get Drums of Forgotten Kings. Secondly, get on this quest Scourge Tactics. If you've already turned it in, you're shit out of luck. Sorry for huge pictures.
First, baseline.
Then get the 10% kings from the NPC. It lasts 30 minutes.
Then apply the 8% kings from your drums (Or somebody elses drums)
Notice that my health went up -both- times, confirming that it stacks. A player will be unable to apply 10 minute kings to you due to a "more powerful spell active" error, but if you get buffed with Greater Kings, you will lose both previous buffs, and your health/stats will go down to match a regular 10% kings.
Note: In order to get the NPC to give you a kings buff, I believe you need to be a spec that will force the NPC to buff you with kings. For me, this was only while being protection spec. You will have to experiment to see which buff the NPCs give you.
Also another thing. Both buffs persist upon entering an instance/raid.
---------- Post added at 01:48 PM ---------- Previous post was at 01:23 PM ----------
Sure are a lot of people viewing, and no comments.