First, here's a damage breakdown with Armor Pen (Dark Enchantments Rank 7 in all offensive slots) - 1835 Armor Pen = 18.8% Armor Penetration
Here's a damage breakdown with those same slots converted to Greater Tenebrous (about 2% arpen from random items)
If you extrapolate the numbers, most likely Tenebrous would have come out ~10% behind on single targets.
I don't know how that would affect multiple targets/AOE in regards to the internal cooldown.
So make from the data what you will, but for now I'd assume they're still better for PVP (due to burst damage) and ArPen is the way to go for PVE (assuming you've got enough of your other stats).
Lots of people have already said as much, but I wanted some finite numbers to at least look at.
Comments
Yeah it is ACT, it works pretty well though can be a little annoying at times.
I've been back to playing with Tenebrous a bit and honestly I may just remove them and sell them and put ArPen back in. Even in PVP the Armor Pen seems pretty nice, particularly when killing GF or GWF.
OP already stated this, just reiterating.
Tenebrous will scale off HP AND can't be mitigated or increased with -mitigation (like with ray of enfeeblement), this makes it much more efficient for low dmg builds like tanky/healer builds.
ArPen will always be superior if you're going the glass cannon route, even for burst, especially since you'll have it under your control.
At 60 with gear, every single player and monster has at least base armor of ~15-20% reduction if not significantly more.
It's defense. The more defense your target has, the more ArP will matter. Find a GF in PvP that is stacking defense, attack him with 2000ArP, and watch him explode.
Hmmmm confused as to the statistics and math.
Lets say we got 20% apen.
They have 2k armor.
Is that:
20% of the armor?
20% of the amount the armor reduces?
20% of the actual reduction?
You want tenebrous after getting your armor pen at a good level. Which is fairly easy to do if you use a ioun stone for it.
It reduces by 20% the amount of reduction offered by defense. If opponent had 30% damage reduction it is reduced to 10%. If opponent had 15% it is reduced to 0%.
Could you do a parse where you have the same amount arcane missile hits on both? I am not sure what to make of this. Ya i can go to Excell and relearn extrapolation. But, i rather stay dumb and lazy.
It's very easy. You use Ancient or Grand Excorcist's Necklace of Blessings, 2x Pyrotechnic Band, and use the same ring and neck on your cat or stone pet. You can also gem two of your offensive slots on your pet for armor pen as well. My wizard has 2222 armor pen and I'm not even using armor pen gems in my three of my offensive slots, or any of the offensive slots on my pet, because I'm already there.
If you want a REALLY rough estimate - the first one has 4554 total Magic Missile hits. The second one has 3746 (82% of #1). So to get a rough estimate of total damage done by everything if you had attacked 4554 times instead, divide the total damage of #2 by .82 = 1,963,678 damage vs 2,197,678 of #1. This is super rough obviously but I'd put it in the realm of 'good enough' to say it is generally worse, but Tenebrous is still better for burst damage if that's your game.