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Pelagor
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re: Update 20.1.2 Hidden Changes (effective May 31, 2017)

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The official Update 20.1.2 Release Notes (effective 5/31/2017) say:

Miscellaneous

  • Various mob ratings have been updated.

https://www.lotro.com/forums/showthread.php?654205-Update-20-1-2-Release-Notes

This little phrase is the understatement of the year whenever you are fighting mobs of level 106 or higher.  This shouldn't matter, since the Update 20 Release Notes (effective 3/20/2017) said:

Miscellaneous

  • You will no longer see any mobs above level 105 (until Update 21).

https://www.lotro.com/forums/showthread.php?652207-Update-20-Release-Notes

But of course Update 20 did not downgrade the level of all mobs to 105 or lower.  Silent Street and the Throne of the Dread Terror include mobs as high as level 108.

One of the "mob rating updates" is to use a totally different mitigation effectiveness table than what is described in your tool tips.  For example, the tool tip on your character tab shows that heavy armor classes reach their maximum mitigation (60%) at 17491 mitigation against level 105 mobs, and prior to 5/31/2017, that scaled smoothly to about 17991 against level 108 mobs.

This is no longer true as of 5/31/2017, even in tier 1 instances.  It now takes about 70100 mitigation to reach the 60% cap when fighting mobs above level 105.  I based this on testing I performed using varying amounts of physical mitigation vs. Rakothas in a tier 1 instance of the Throne of the Dread Terror.

Here is my data table I logged in Excel during testing:

 

Heavy Armor Physical Mitigation Damage Taken Percent of Damage Received
                              -         131,658 100.0%
                           513       130,145 98.9%
                        2,109       127,758 97.0%
                        7,591       116,280 88.3%
                      11,423       109,327 83.0%
                      16,532       101,163 76.8%
                      17,455         99,805 75.8%
                      25,523         89,210 67.8%
                      37,794         76,502 58.1%
                      43,325         71,776 54.5%
                      48,856         67,538 51.3%
                      51,622         65,578 49.8%
                      54,387         63,715 48.4%
                      59,918         60,250 45.8%
                      61,359         59,400 45.1%
                      64,099         57,838 43.9%
                      68,707         55,364 42.1%
                      69,117         55,152 41.9%
                      69,630         54,889 41.7%
                      70,058         54,672 41.5%
                      70,468         54,661 41.5%
                      72,396         54,661 41.5%
                      75,162         54,661 41.5%

Note the damage taken never drops below 41.5%, even though heavy armor is supposed to cap at 60% mitigation (target takes 40% damage).  I suspect at tier 1 mobs reduce that maximum mitigation by one half of one percent for every level they are above the target (Rakothas is level 108).

I also had Excel compute a trendline for both Damage and Percent of Damage Received.  The best fit was a third order polynomial function (R squared = .9999 for both functions).  Here are the formulas when the unmitigated damage is 131658:

x = Physical Mitigation (works only for heavy armor classes; Medium/Light will have a different formula)

y = Damage Taken

z = Percent of Damage Received

y = (-1 x 10^-10)x^3 + (2 x 10^-5)x^2 - 2.1953x + 131658

z = (-9 x 10^-16)x^3 + (2 x 10^-10)x^2 - (2 x 10^-5)x + 1

 



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Pelagor
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re: Update 20.1.2 Hidden Changes (effective May 31, 2017)

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It appears SSG might be planning to do a hot fix to correct this issue rather than living with it until Update 21.  See the blue name post here:

 

https://www.lotro.com/forums/showthread.php?654243-PLEASE-lower-Throne-Raid-Mobs-to-lvl-105-New-system-is-unfair-with-LvL-108&p=7728025#post7728025

 

So don't go out and start grinding mitigation essences quite yet.  Fortunately I had stashed about 40 teal tier 7 physical and tactical mitigation essences in the kinhouse chest that I used to do this testing, so if this all gets reversed the most I will be out will be a few essence reclamation scrolls (and about 10G in repair bills).



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Gilderbrand
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re: Update 20.1.2 Hidden Changes (effective May 31, 2017)

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Looks like the patch is tomorrow, 6/6. They say it will fix the problem.

 

Pelagor
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re: Update 20.1.2 Hidden Changes (effective May 31, 2017)

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I confirmed the 6/6/2017 patch fixed the problem.  The way SSG fixed the problem is they reduced the level of all mobs in the Silent Street and Throne of the Dread Terror to 105, so the instances are now slightly easier than they were before 5/31/2017.

With no physical mitigation at all, Rakothas's first distributed damage attack does 119101 damage, down from 131658.  This difference appears to be due to the lowering of his level from 108 to 105.

I then equipped just enough physical mitigation (18071) to reach the maximum mitigation (60%) per my character's tooltip, and I took 47640 damage, which is almost exactly 40% of 119101.  Lastly, I overstacked physical mitigation (28830) and confirmed the damage taken did not change (still 47640).



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