I tend to use Charging Bull, Throwing Blades, Hidden Blades, and Combat Roll. I feel like you shouldn't need more than one guard generating weapon/ability at a time, at least on Perilous. It might be necessary on Nightmare. Either Savage Thorn, Charging Bull, or Flashing Steel; no need to double up if you feel like using other weapons or abilities.
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Deathblow could be use effectively if you are in the middle of a large group. If you are trying a tank build with War Cry, you might as well use Deathblow as well. It hits multiple enemies, knocks down multiple enemies, and if you happen to kill one of them (which is very likely), you can spam it between War Cries.
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War Horn can be very useful for people with lower crit chance, but do you actually use it with 100% crit chance? Just attack something, and voila, everything is panicked!
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It's all about the crit chance. If I were you, I would assume that most people posting here have pretty good crit chance, and so Hidden Blades and other abilities with long cooldowns or high stamina costs are considered just as viable as skills with short cooldowns and low stamina costs. First thing I would do is equip weapon and armor upgrades that increase cunning or crit chance.
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Lets be real now... how often are you not being hit when playing Pala? I don't think I ever go through a game with here not being hit at least every 5 seconds. 
I agree completely. And you're the only one to ever mention Deathblow, which is in my opinion one of her best abilities, I prefer it over Hidden Blades.
If you want to dominate with Pala (like I've rarely seen even with top 50 leaderboard), just build her for speed. What does that mean? It means you want everything with low cooldown, fast animation and "AOE".
Equipment
Bloody Bargain and Savage Thorn. Be sure to have as much Critical Chance as possible.
Bloody Bargain is gonna make you hit faster which means faster cooldown, faster Stamina regeneration, faster Guard generation from Savage Thorn and faster killing. You really can't go wrong.
Savage Thorn should generate enough Guard to sustain yourself without ever needing Heal on Kill. If not, then get some Heal on Kill, but I doubt it's gonna be necessary.
Skills
Charging Bull, Combat Roll, Throwing Blades, Deathblow (all upgraded).
Passives
Flow of Battle, Looks Like It Hurts.
Only take Dance of Death if you're not generating enough Stamina with Opportunity Knocks.
Strategy
- Spot the largest group of enemy
- Charging Bull in to knock them down and build Guard
- Throwing Blades to soften of kill everything around you
- If there's something still standing, Deathblow on an enemy with less than 50% Health which will not trigger a cooldown if you kill it so you can chain Deathblow a couple times in a row without any cost
- Rinse and Repeat
This is the fastest and most effective way to kill with her. On Nightmare, even the toughest mobs don't last more than 3 seconds, except the Saarebas which takes around 5.
Never underestimate how good Deathblow is. It's spammable (no cooldown if you kill with it), very fast animation, AOE and amazing damage. You just need to learn when to use it, meaning on enemies with less than 50% health. The bigger the group around you, the better Deathblow becomes.
At some point, you should be able to chain Charging Bull and Throwing Blades non stop, meaning your cooldowns should be low enough so that those 2 abilities can always be used whenever you feel like it. If not, get more Critical Chance, it will make her fly.
You shouldn't need Combat Roll all that much, but when needed you do have the option to get out of trouble easily.
Why no Spinning Blades? Because Guard shouldn't be an issue and it has a "slow" animation. Yes, Spinning Blades is slow and not that good at targeting. I understand that when you push the button, you just relax while the whole thing happens, but that's wasted time. You can do more damage and gain more Guard by doing something else. The more you use your abilities, the easier it gets for your teammates.
I'm gonna put emphasis on this, even though I'm talking about speed, everything I've been advocating is built around you generating as much Guard as possible. Savage Thorn is paramount here, but combined with the speed of Bloody Bargain and the AOE from Charging Bull, Throwing Blades and Deathblow, there's a lot more Guard generated than most people realize. On top of that, you'll be flying on the battlefield and killing faster than almost everybody. So you'll have an extremely good tank that's also a powerhouse damage dealer. Faster is always better.