resistance penetration support vs. other supports for damage

I've really been struggling with this dilemma for some time. Let's say you're playing on merciless difficulty. You use a spell that does fire damage. You only have 1 socket to link with a support gem. Is it better to do something that boosts damage directly, like elemental focus, or something that penetrates resistance? Like... well.. fire penetration?
I realize there are a lot of variables to this, but in general, which is a better choice?
Last bumped on Sep 22, 2016, 7:47:21 PM
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Allerdyne wrote:

I realize there are a lot of variables to this, but in general, which is a better choice?


If you're dealing all one element or mostly one element, you NEED Penetration. Penetration works even if the enemy is at 0 or negative resistances, which means it will always boost your damage.

The amount by which it boosts your damage is quite substantial, too, notwithstanding the "lot of variables" you mentioned. (Basically, there are a couple exception cases where Penetration Support is not THAT great - but in nearly all situations it is an amazing choice).
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Penetration works best against high resistance mobs, who also happen to be the kinds of mobs you need the most damage anyway.

I can't remember exactly how much it was, buy last time I did the math a Penetration gem with nothing else reducing resists equates to about 2.5 times more damage against 75% resist mobs. They're not so common these days but you'll still notice them when you run into them.
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Even if you have high curse effectiveness and are running flammability, I would still socket fire penetration.

Maybe if you are using EE too, then you might get away without fire pen. Or running ele weakness too or something.
Face it, all of your suggestions are worse than this idea:
http://www.pathofexile.com/forum/view-thread/657756
Last edited by dudiobugtron#4663 on Sep 22, 2016, 2:40:13 AM
Just some simple math to illustrate the importance of elemental penetration.

Lvl 20 fire penetration= 37% penetration

On a monster with 80% fire res:
Without pen
- Monster takes 20% of fire damage
- 100 fire damage x 0.20 = 20 damage
With pen
80%-37%= 43% fire res remaining
- Monster takes 57% of fire damage
- 100 fire damage x 0.57= 57 damage

So on a high res monster you almost triple you damage with this one support gem. In general I think a 30% increase in damage from adding a support gem is normal.
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pen > all
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PuppySatan wrote:
Just some simple math to illustrate the importance of elemental penetration.

Lvl 20 fire penetration= 37% penetration

On a monster with 80% fire res:
Without pen
- Monster takes 20% of fire damage
- 100 fire damage x 0.20 = 20 damage
With pen
80%-37%= 43% fire res remaining
- Monster takes 57% of fire damage
- 100 fire damage x 0.57= 57 damage

So on a high res monster you almost triple you damage with this one support gem. In general I think a 30% increase in damage from adding a support gem is normal.


pretty much exactly. penetration basically acts like a 'more' but not exactly because
of existing resistances... its like an inverse more. a LESS. LESS resistance is MORE damage.

Good to know. Thanks, people.

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