You are fighting Researcher Thek`Rak in spires. His resists are fairly average high-but-not-immune for a raid mob (8, 9, 9, 8, 8 on Bard Jayla's). He's level 69. We'll assume he's suffering from Malosini, Tashania, and just to give Wizards a little advantage, Rangers are keeping Exposure up around the clock.
We'll assume the Wizard has Glyph of Shojar while the Necro has Glyph of Sivyana. We'll assume they have the same Focus/Tome/etc percentile mods on their damage (I'm going with base+82.2% from about 24% damage focus, 9% elemental focus, 250 Specialize Energy/Defense, 20% Codex of Power and no Evocation/Conjuration mods). Less important, but Mana costs will be reduced to ~80.5% from 7% Focus and 250 Specialize Focus/Mind. We'll assume they both have 250 Specialize Focus/Mind, 335 effective CHA and +10 Divination mods. We'll assume they both have 30% base crit chance for the spells they are using (5% inherent + 7% Spell Casting Fury + 6% Fury of Magic/the Arcane + 8% Supreme Charm of Magic + 4% from Tomes). For the Necro this increases their damage by 30% on average. For the Wizard this increases their damage by 45.6% on average because each point of crit is worth +1.52% considering UBs and Primals on average. Justified here:
25% of crits are UBs, 2% of UBs are Primals
Breakdown of a point:
0.75 is *2 = 1.5
0.245 is *4 = 0.98
0.005 is *8 = 0.04
1.5 + 0.98 + 0.04 = 2.52
In our example:
70% are *1 = 70
22.5% are *2 = 45
7.35% are *4 = 29.4
0.15% are *8 = 1.2
70 + 45 + 29.4 + 1.2 = 145.6% average damage; 45.6 / 1.52 = 30
The Wizard is casting Moon Comet, which has a -20 cold adjust, plus -25 from Glyph of Shojar. In the current system, their chance to be fully resisted in our example works out to 12.42%. The chance to be partially resisted is also 12.42% (always approximately equal chance of full or partial for nukes). Partial resists may be anywhere from 1% to 99% reduction with equal chance throughout; we'll consider the average reduction to be 50%, and combined with the full resist chance the reduction on average will be 18.63%.
The average damage per Moon Comet in this instance will be:
Focuses: 2575*1.822 = 4691
Crits: 4691*1.456 = 6830.096
Resists: 6830.096*(1 - 0.1863) = 5557.6491152
Efficiency: 5557.6491152 / 423 [525*0.805] = ~13.13865039
Under the new system it would instead be like this:
Focuses: 2575*1.822 = 4691
Resist adjustment: 4691*(1 - 0.1863) = 3817
Before crits, and assuming resist value does not change on our target, damage will always be 3817
With crits, average damage will be 3817*1.456 = 5557.552
Efficiency: 5557.552 / 423 = ~13.13842080
The new system is slightly off due to having to use a short hand to approximate the averages (can't put decimals into real damage amounts, etc). On the other hand, the new system also has a lower minimum; in the old system, there's always at least a 0.2% chance of being fully resisted and 0.2% chance of being partially resisted (~0.3%), but in the new system the minimal adjustment will be 0. And then there's also casting time saved when something is fully resisted in the old system, which won't happen in the new one.
The Necro is casting Claws of the Chill, which has a -200 cold adjust. In the current system, the chance to be fully resisted in our example works out to 0.23%, the minimum for DoTs (DoTs have an advantage over Nukes even with the same resist values, presumably to make up for no partials).
The average damage per Claws of the Chill in this instance will be:
Focuses: (645*4)*1.822 = 4700
Crits: 4700*1.3 = 6110
Resists: 6110 *(1 - 0.0023) = 6095.947
Efficiency: 6095.947 / 387 [480*0.805] = ~15.75180103
Under the new system it would instead be like this:
Focuses: 645*1.822 = 1175
Resist adjustment: 1175*(1 - 0) = 1175
Before crits, and assuming resist value does not change on our target, damage will always be 1175 per tick.
After crits, average damage per cast will be (1175*4)*1.3 = 6110
Efficiency: 6110 / 387 = ~15.78811369
There's a slight improvement here because the minimum 0.23% resist chance is not preserved in the new system. The new minimum is 0. However, the 0.23% chance to be resisted in the current system is so low we may as well consider them equal except in freakishly rare cases when it gets resisted once in the course of the fight.
If our target in this instance had no cold resist debuffs, damage per tick before crits would be 1175*(1 - 0.0946) = 1063 and per cast after crits (1063*4)*1.3 = 5527.6; -20 cold resist debuffing would be sufficient to eliminate the reduction.
The Necro is casting Marlow's Cremation, which has a -125 fire adjust. In the current system, the chance to be fully resisted in our example would be 8.15%.
The average damage per Marlow's Cremation in this instance will be:
Focuses: 420*1.822 = 765*6 = 4590
Crits: 4590*1.3 = 5967
Resists 5967*(1 - 0.0815) = 5480.6895
Efficiency: 5480.6895 / 375 [465*0.805] = 14.615172
Under the new system it would be like this:
Focuses: 420*1.822 = 765
Resist adjustment: 765*(1 - 0.0815) = 702
Before crits, and assuming resist value does not change on our target, damage will always be 702 per tick.
After crits, average damage per cast will be (702*6)*1.3 = 5475.6
Efficiency: 5475.6 / 375 = 14.6016
A few points of damage are lost to decimal rounding.
The resist adjust on Marlow's Cremation is smaller, and in this case at least -95 fire resist debuffing would be necessary to eliminate the adjustment; in our case Malosini only provides -60. If our Druid had landed Tarhyl's Raging Curse, that in itself would have been enough.
The Necro is casting Caress of Sivyana, which has 0 poison resist adjust, plus -25 from Glyph of Sivyana. In the current system, the chance to be fully resisted in our example would be 17.48%.
The average damage per Caress of Sivyana in this instance will be:
Focuses: (498*1.822) = 907*4 = 3628
Crits: 3628*1.3 = 4716.4
Nuke portion: 4716.4 + (215*1.822) = 5107.4
Resists 5107.4*(1 - 0.1748) = 4214.62648
Efficiency: 4214.62648 / 407 [505*0.805] = ~10.35534761
Under the new system it would be like this:
Nuke Portion:
Focuses: 215*1.822 = 391
Resist adjustment: 391*(1 - 0.1748) = 322
[Note that Nuke portions of DoTs are considered DoTs as far as resist chance goes; they can't partial.]
DoT Portion:
Focuses: 498*1.822 = 907
Resist adjustment: 907*(1 - 0.1748) = 748
Before crits, and assuming resist value does not change on our target, damage will always be 748 per tick.
After crits, average damage per cast will be (748*4)*1.3 = 3889.6 + 322 = 4211.6
Efficiency: 4211.6 / 407 = ~10.34791154
For this one we'd need -135 poison resist debuffing to fully negate the resist adjustment, which is of course not reachable.
The Necro is casting Scitterpox which has a -5 disease resist adjust. In the current system, the chance to be fully resisted in our example would be 22.13%.
The average damage per Scitterpox in this instance will be:
Focuses: (290*1.822) = 528*9 = 4752
Crits: 4752*1.3 = 6177.6
Nuke portion: 6177.6 + (125*1.822) = 6404.6
Resists 6404.6*(1 - 0.2213) = 4987.26202
Efficiency: 4987.26202 / 423 [525*0.805] = ~11.79021754
Under the new system it would be like this:
Nuke Portion:
Focuses: 125*1.822 = 227
Resist adjustment: 227*(1 - 0.2213) = 176
DoT Portion:
Focuses: 290*1.822 = 528
Resist adjustment: 528*(1 - 0.2213) = 411
Before crits, and assuming resist value does not change on our target, damage will always be 411 per tick.
After crits, average damage per cast will be (411*9)*1.3 = 4808.7 + 176 = 4984.7
Efficiency: 4984.7 / 423 = ~11.78416075
Obviously time is the key consideration missing in all this if we were trying to compare Wizards to Necros, but that's something for another thread (also a lot of the values for Necros will be moot if the adjustments I slated for next patch do go in). But just as an example of the kind of giant Necro-killing, Wizard-loving nerfs we are looking at, here~