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I've put together a Slasher fit in EFT that looks like this:

[Slasher, FW slasher]
Damage Control II
Micro Auxiliary Power Core I

Medium Azeotropic Ward Salubrity I
J5b Phased Prototype Warp Scrambler I
1MN Microwarpdrive I
X5 Prototype Engine Enervator

125mm Light 'Scout' Autocannon I, Republic Fleet Phased Plasma S
125mm Light 'Scout' Autocannon I, Republic Fleet Phased Plasma S
125mm Light 'Scout' Autocannon I, Republic Fleet Phased Plasma S
E5 Prototype Energy Vampire

Small Anti-EM Screen Reinforcer I
Small Anti-EM Screen Reinforcer I
Small Anti-Thermal Screen Reinforcer I

One thing that eludes me to this day is exactly how energy vampires work. I note that the item description in-game says that it won't drain below your own cap level, so does that mean energy vamps are useless if you are cap stable? Would you be able to neut someone's cap dry with this fit?

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2 Answers 2

An Energy Vampire (aka a NOS) at it's base removes capacitor energy from the target ship and adds it to your own. But it only works if the enemy has more cap than you do, in terms of percentage. I.e. if you have 10% of your cap left, and your target has 50%, then every cycle of the NOS will transfer some of the targets cap to your own. If you have %90 cap, and your enemy has %50 cap, then no energy will be transferred, but the NOS will still cycle.

Every cycle makes the measurement of cap levels again, and cycles that don't actually transfer any cap, don't actually use any of your own cap either, so usually people just leave it on Auto-repeat and keep it going the entire time they are within range. It will only turn off if you go out of range.

So what does this mean in reality? Basically there are usually a few places where you see this used (and this doesn't cover all uses, just some of the most common I've seen) :

  1. A ship that uses modules that rely on relatively large amounts of cap and is not cap stable without it. The NOS will be used to keep stuff going as much as possible, longer than it might have been able to without one. Examples of these modules are probably most commonly Armor Repairers, but to a lesser extent might also be MicroWarp Drives, Shield Boosters, Afterburners, Warp Disrupters. Probably others as well. Usually the tactics with such ships are to burn in close and run the repairer enough to mitigate enough damage to turn the fight in your favour. When the repairer runs your cap low, the NOS will be sucking cap back from your target that you can use to run the armor repairer.

  2. A ship that wants some defense against Neutralisers. A Neutraliser in the right situation could remove all your cap, leaving you without the ability to run your own warp disruptor, scrambler, webber or other active modules. Usually this means it will either give them a lot easier time to escape, or it might even shut down your active resistance modules like Invulnerability Fields, making you easier to kill. Having a NOS might give you enough cap back to still run the essential modules you need even under neutraliser pressure.

  3. PvE fits where you expect to have rats close up a lot of the time. Because of how NPC AI works, they often act as though they are at 100% capacitor all the time, so when you use a NOS on them, they will always transfer cap to you. This means you might be able to swap a Cap Recharging module or two out for something more useful if you are using a NOS.

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The primary purpose of a NOS is to allow you to continue to run cap-using modules even when you're not capstable or when you're being neuted by your enemy.

Frigates are very vulnerable to Energy Neutralizers due to their small cap, fitting a NOS may allow you to keep a point on our target even when you're being neuted. And if you're not capstable, a NOS will allow you to run your modules for longer or even make you capstable when you're in NOS range.

No, you can't neut an enemy dry with a NOS, you need a Neut for that.

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Well, you can't completely drain them with a NOS, but you can definitely break their stability if you keep your own cap low. –  Phill.Zitt Apr 2 '13 at 14:26
    
@Phill.Zitt if I were to swap the Medium Shield Extender for a Medium Ancillary Shield Booster, and let that run off the cap, would I then be able to neut someone dry? –  cornjuliox Apr 3 '13 at 12:59
    
@cornjuliox with a NOS? not reliably. A neut is always better than a NOS for completely capping someone out. NOS is used when you need a little more cap and are already fighting inside of that range. –  Phill.Zitt Apr 3 '13 at 16:12

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