"X" is any other ability that's off cooldown at that time (a filler ability). I think that GS is supposed to be GC (Grand Crusader proc) but I'm not that up to speed on some acronyms so I could be mistaken myself.
Yes, GC is Avenger's Shield when you get a Grand Crusader proc and it will grant Holy Power.
Since this guide is not only outdated but also was incorrect when it was written, I'll just try to summarize the Prot Paladin rotation/priority here:
Single-target rotation:Crusader Strike
is the backbone of your rotation. Using it on cooldown grants you the highest amount of Holy Power.
CS - x - x - CS - x - x - CS - x - x -CSJudgement
is your next highest priority. It also grants Holy Power every time, but because it has a slightly longer cooldown, you will occasionally have to let it sit off of cooldown for Crusader Strike.
CS - Judge - x - CS - x - Judge - CS - x - x - CS - Judge - x - CS
The "x" are filler abilities. You want to prioritize your filler abilities based on their survival benefits, and failing that, what does the most damage.
The only filler ability that grants Holy Power is Avenger's Shield when Grand Crusader procs
, abbreviated GC. This is your next highest priority.Sacred Shield
is a self-buff that procs an absorb shield on yourself periodically. You want to keep this up as much as possible, so I would recommend prioritizing it after all your Holy Power abilities. There are some advanced techniques involving Sacred Shield and your vengeance/attack power values, but for someone new to the class I wouldn't be that worried about it. Just reapply it if you see it under roughly ~6 seconds, but it's not the end of the world if it falls off for a bit.
After that, your rotational abilities are purely damage-dealing fillers.Avenger's Shield
hits 3 targets for a large amount of damage, and should be your highest priority of these.Holy Wrath
hits quite hard nowadays, and should be next. Note that the Holy Wrath in-game tooltip is a lie.Hammer of Wrath
is only available sub-20% health, technically it's our Execute, but it actually does a bit less damage than Holy Wrath.Consecrate
is your lowest priority for single-target, but it's still not bad.
AoE rotation:Hammer of the Righteous
gets subbed in for Crusader Strike. Otherwise, the important survival portion of your rotation is the same - after all, your goal is to live, no?
Your filler abilities look different though. Avenger's Shield is still great because it hits three targets for a truckload, but Consecrate really pushes ahead of everything else. Hammer of Wrath is single-target, and Holy Wrath splits its damage among all targets in range (it's an odd ability).
Level 90 talents:
Our level 90 talents play different roles depending on which you take. I honestly refuse to put Holy Prism and Light's Hammer into a typical "rotation" priority because if you're using them in a raid, it's pretty obvious when they're useful. Holy Prism
is taken for the 5-target splash heal off of your current target, or you may use it on a specific friendly target to pick up stray adds. It's not going to obey your rotation, and you honestly might skip a Holy Power generator to line it up with a hard-hitting ability.Light's Hammer
is a ground AoE that deals damage and healing to everything within it. It's pretty obvious when it's useful, and again does not obey your typical rotation.Execution Sentence
is only taken for single-target DPS, and my understanding is that while you ideally would use it behind Avenger's Shield but ahead of Holy Wrath (as a filler ability), the smart way to max your DPS with it is to time it right after you take huge damage and have high Vengeance attack power. So again... it doesn't obey your typical rotation.
I might just write a Prot guide next tier. I'm going to have to ticket to get my Holy guide taken down because there is just no way I'll be keeping up with the 5.4 changes. I barely heal anything anymore >.<