FULLY CONFIRMED

For channeled and and spells with cast time, the formula is:

cast time/3.5*100%

For dots, the formula is:

duration/15*100%

No difference, you say? Well, there is a HUGE difference. The hard cap of 100% has been removed!

Keep in mind that there are 3 penalties: AoE spells have their coefficients cut by 66%, and spells with both damage and healing get a 50% penalty. Spells with a snare effect have a 5% penalty. Drain soul also gets a 50% penalty, too, for no reason whatsoever. (Well, almost. 20 dpm with 700 spell damage gear . . .)

Old numbers in brackets.

Corruption: 120% (100%)
Curse of Agony: 160% (100%)
Siphon Life: 100% (50%)
Drain life: 71.5% (50%)
Drain soul: 215% (50%)
Curse of Doom: 400% (100%)
Soulfire: 171% (100%)
Hellfire: 141% (33%)
Rain of Fire: 76% (33%)
Dark Pact: 96% (0%)
Unstable Affliction: 120% (N/A)

The big winner is clearly curse of doom. 800 spell damage will double its damage. 10k curse of dooms will be commonplace. 35 damage per mana. Good thing its not usable on players, eh?

The other big winner is hellfire. Before the change, to get the same benefit from spell damage as emberstorm, you would need 1080 spell damage. Now, you need 255. Huge buff.

Unchanged spells: Immolate (20% + 65%), Shadow bolt, searing pain, deathcoil, lifetap (80%)


Thank you, Shadowbolt, for your testing.


Currently untested:

Incinerate: does it scale as a 2.5 spell before the bonus immolate damage? Does the bonus damage scale too?
Shadowfury: blastwave and CoC had their coefficients buffed. Will shadowfury get the same treatment?
Seed of corruption: level cap is 67 :(

Credits

Shadowbolt <Prophecy> for warlock testing
Iskaral <The Dark Embrace> (EU) for priest testing
Holyman for creating the thread on the EJ forums
Me for the hype.

edit: i don't think I have missed anything . . .

PPS: lets consolidate all the new BC scaling numbers into this post.

For mages/priests reading this: Arcane Missiles gets 142.7%, Starshards 171%, SWP 120%, Devouring plague 80%. Pyroblast front end went up slightly, but 60% is tacked onto the dot.

Awesome! This will make Pyroblast and Soulfire quite deadly.

Drain Soul gets what?!

Wow. Mana efficiency just changed across the board in our favor.

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Q u o t e:

???

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I'm a little confused myself. Why would it get so much?

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Q u o t e:

Also, was Drain Life Increased or Decreased?

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Increased. It currently gets 50%.

I came up with the 71-72% number as well, after watching shadowbolt's felguard video and seeing his DL tick for 163 with ~465 +dmg and 18% boost.

Since drain life gets half benefit because it heals, 2 * 71.5% = 143%, which is exactly 5/3.5

Well it is .... 15 seconds channeled right?

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Q u o t e:


Ho SNAP, is that why SoulFire was critting for SOOOOO Much?

Also, was Drain Life Increased or Decreased?

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~20% buff to the spell damage coefficient.

from 50% to 70% and change.

That's crazy. That could make Drain Soul actually... deal damage. Really really mana-efficient damage.

I think the world would come apart at the seams if Drain Soul turned into a damage spell - but how awesome would that be?

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Q u o t e:


Thats the bonus soul fire gets... but Soul Fire is a base 6 second cast?

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I would have though soul fire would get 171% being a 6 second cast yes. I'm not in beta so I cant test it though.

They still are probably setting the +dmg coefficient on a spell by spell basis though for balance reasons.

Wait.

Wait.

429% for a 15 second channelled spell?

Hellfire is 15 seconds channelled...

uh this is jsut speculation i doubt any of this is true.

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Q u o t e:


Thats the bonus soul fire gets... but Soul Fire is a base 6 second cast?

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I meant 171.4% for soulfire

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Q u o t e:
Hellfire is 15 seconds channelled...

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But it's an AoE, so it suffers a severe penalty like it does now.

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Q u o t e:
Wait.

Wait.

429% for a 15 second channelled spell?

Hellfire is 15 seconds channelled...

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I don't think it would affect AoEs in the same fashion, though. I imagine AoE penalties still apply... but it should still be gaining a lot more than it used to, which is good. AoE scaling in the current game sucks a big one right now.