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i want to know if i can just get away with Hide and a Stealth IO to be invisible from Heros
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Short Answer: "No".
You'll need Stealth + Hide + a Stealth IO to hit the Stealth cap in any Zones.
These days anything short of the cap might as well be lit up like a Christmas tree.
For more info, see Stealth Cap info for Issue 11
Just to follow-up on what Mael already said, Hide + a Stealth IO gives you 800 ft of -perception. Since base perception is 500 ft, anyone with 300 ft or more +perception will be able to see you. In Siren's that means a defender with Tactics, anyone with one application of CM/Clarity and everyone with the usual +perception powerset self-buffs (Targeting Drone, Cloak of Darkness, Focused Senses, etc...). Even IR Goggles and a +perception IO would be enough nowadays 
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CoX 50s: <ill/rad> <ice/ice> <fire/kin> <grav/sonic> <ice/storm> <earth/kin> <kin/elec> <cold/psy> <thugs/dark> <fire/dark> <dark/elec> <night widow> <EM/ninj> <mind/icy>
A Stalker not at the stealth cap in a pvp zone is a very popular target. Most Blasters use them to get warmed up.
This I found out the hardway 
Anyone can now see a Stalker with JUST Hide and Stealth or a Stealth IO. And I mean anyone.
All you have to do is modify your build to get Tactics (I think that's the one...) and put a +perception IO in it, providing 2 layers of perception. This, however, doesn't see a Stalker with Hide, Stealth, and a Stealth IO. But anything that could previously see a Stalker with just Hide can now see a Stalker with all 3, and some things can get 4 layers of perception, I think that being the max... eg, Super Reflexes Scrapper gets +Perc from SR, then Leadership, then Focused Accuracy, and then a Perc IO.
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Anyone can now see a Stalker with JUST Hide and Stealth or a Stealth IO. And I mean anyone.
All you have to do is modify your build to get Tactics (I think that's the one...) and put a +perception IO in it, providing 2 layers of perception. This, however, doesn't see a Stalker with Hide, Stealth, and a Stealth IO. But anything that could previously see a Stalker with just Hide can now see a Stalker with all 3, and some things can get 4 layers of perception, I think that being the max... eg, Super Reflexes Scrapper gets +Perc from SR, then Leadership, then Focused Accuracy, and then a Perc IO.
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Actually that's not quite true.
Different "Layers of perception" can have vastly different buff values.
For Example, Stealth equates to -389 foot perception, The Stealth IO grants -300 Feet.
Tactics on a level 30 (Sirens Call) Tank/Blaster/Scrapper is +186.2 Feet, The Perception IO grants +100 Feet. That combines for +286.2 Feet- less than a Stealth IO and over 100 feet short of seeing through Stealth.
Even a Controller (+266.0 feet) can't see through "Stealth" with Tactics plus a Perception IO at level 30. Only a Defender (+332.5 feet) can. If you want more information, I suggest you visit the link I posted above.
True, but a Stalker's target has easily enough time to pull them out of Hide or run away by the time they are spotted.
??? 
???
If you can't see through their Stealth, you won't see the Stalker until they hit you.
At the Stealth cap (which is what we're all advising the OP to get to) you have 10 feet in which you can see a Stalker. That's close enough to see them start an "Assassin's Strike" right next to you (if you're alert) but not close enough to see an EM Stalker start diving towards you with a Built-Up Energy Transfer.
If you've less than Tanker-level HP, can't see a Stalker and you're not constantly moving, you're dead.
My EM Stalker can Two-Shot anything short of a Tanker in Sirens' Call: if you can't see him coming, the only warning you get will be the "Assassin's Strike" message followed by an already-queued Energy Transfer to the Head. And there are far better Stalkers out there than me... 
i anna make an Nrg stlaker for PvP now 
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i anna make an Nrg stlaker for PvP now
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Oh joy.
The Smoking Demon
Ash/Tar Corruptor
Union
@The Smoking Demon
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i anna make an Nrg stlaker for PvP now
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Try spines if you want a little more of a challenge and flexibility, oh and you wont be the power set that 90% of other stalkers are *yawns*
Hi all
I allready have a Stalker that i have had a while now with Stealth and GI in the build. The reason for the GI is that i always teamed with a friend in Sirens who also had GI in his build,but unfortunatly he has now left the game. So i have created a Spines / Willpower Stalker but i want to know if i can just get away with Hide and a Stealth IO to be invisible from Heros. Instead of putting in the build Hide + Stealth + Stealth IO.
Or any other suggestions to make me as invis as possible would be very much appreciated please. Thank u all