If I recall, wasn't Y'shaarj, or however you spell it, assumed to be dead until this point in time? Garrosh is filled with Pride so we have the manifestation of the Sha coming because of him, however thats not whats corrupting him, NOR why they are choosing to defend him.
Why would the Paragon encounter be number 13 but the Sha Encounter be number 3? Doesn't make sense. What happened is that Garrosh found this Old Gods heart, who happens to be the Klaxxi's God, and is being slowly corrupted by the god to become his shell for the mortal world.
TL;DR - Garrosh is being turned into an Old god so the God can "live" again and the Klaxxi are stopping us from killing him cause the Old god is their god and creator.
3 start out active. As you defeat one, it will grant an ability to a member of your raid, the other 2 will heal, and one on the bench will join the fight against you. Repeat that process 9 times, and you win.
Garrosh has Y'shaarj's heart, the klaxxi want it back to ressurect him or something. They see you as a threat in their path, so they try to kill you. Probably.
The Shas are the "shadows" of the heads. They are not the heads themselves. Shadow is clearly a metaphor... or perhaps, more accurately it's an attempt at describing something that's very hard to describe, like a ghost. These "heads" may also be a metaphor like different faces or aspects of one being-- of course, we are talking about an Old God, and, though all our experience so far has been that Old Gods are mostly eye-centric, it wouldn't be surprising if he actually had 7 heads.
The Klaxxi warred against the Queen because her corruption was causing her to act in a way that was detrimental to the natural cycle of the mantid, which the paragons and klaxxi were created to uphold. That's why I'm not too broken up about killing them, they were never good guys. They wanted to return the Mantid to normal, which includes trying to swarm over pandaria every few generations and worshipping old gods.
If you ask me it's a bit full with plotholes...
It makes little sense for the Klaxxi to have opposed their queen who was doing the Sha's bidding... which was an indirect result of their Old God. Wether or not the Sha of Fear was destroying their 'normal way of things' is also kinda pointless, since ... Old Gods normally care even less about their subjects and would probably be even more sadistic and cruel...
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---------- Post added 2013-06-15 at 07:31 AM ----------
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And as others have said, the Sha are just shadows. Y'Shaaraj is who they follow, and it is he who is imprisoned in the Titan device recovered during the Dark Heart of Pandaria scenario. And the Dungeon Journal for Garrosh makes it plain that as he absorbs more and more power, he becomes progressively corrupted until he effectively IS Y'shaaraj manifested in a new avatar. Whether the Mantid are seeking to follow Y'Shaaraj through Garrosh or recover the Old God's essence, they end up opposed to us.
What real-life culture acts in a way that is wholly consistent with a set of rules / principles / logic / rationality ? None. Things get mucked up, and there is tension in attempts at reconciliation.
Well I see 2 different reasons to why we fight the Klaxxi Paragons.
The first is that they believe that Garrosh is the true manifestation of Y'Shaaraj. And since that is basicly their god/deity/leader they will follow him to the death.
The other is that they believe Garrosh is using the heart of Y'Shaaraj for the wrong purposes and they want to take it for themselves. When we show up they see us as a threat to their plan and wants to get rid of us.
Best guess is that want the heart and have come for it and we need to stop them from getting it
I really doubt they are there to help garrosh
they prolly want the heart to put in there little museum with other y'shaarj memorabilia and they think by having the heart they can charge 20 gold to mantid tourists
The way I see it is like this. Destroying but not killing something as powerful as an Old God has a lot of side effects. We're seeing that in game as the Sha. Call it background radiation left by the destruction of the immensely powerful Old God that over time and because of the nature of the being that caused it started to manifest as the sha. Vastly weaker than the old god but still powerful in their own right.
The Klaxxi worship the old gods and we can either assume they are coming to try and grab the heart as its part of their deity or they see Garrosh as being an avatar of said old god.
As someone who is still leveling through Pandaria, I had a question: where does Garrosh get Y'sharrj's power from? I'm assuming it's explained in the Dark Heart of Pandaria scenario, tho I kind of don't want to assume too much right now.