Star Trek Online Question on shield resists
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Lt. Commander
Join Date: Dec 2007
Posts: 120
# 1 Question on shield resists
06-24-2011, 10:54 AM
This might be one of those questions for some of the STO number Guru's such as BigRedJedi, but I was wondering if anyone knew how the 20% damage reduction tags in shields were applied when running shields at maximum resist?

IIRC the current maximum shield resist attainable is 75% (could be wrong), but how does stacking that with a shield with say a [pha] tag affect this max number?

For example:

With 125 shield power + EpTS 3 + TSS2 getting the max shield resist value is possible, but if I'm using a Covarient MX XI shield with [Pha] [Dis] [Pol] does that extra 20% resist value get factored into the resist calculation when attacked by those weapon types?

I've read a lot about calculating shield resists but I have found very little about how the reduction tags are factored in overall shield damage mitigation.

Thanks!
-JB
Lt. Commander
Join Date: Dec 2007
Posts: 120
# 2
06-24-2011, 07:53 PM
All of the Shield Damage Resistance Buffs are additive up to the cap of 75%. And the total damage resistance is a straight reduction on the amount of incoming damage. (i.e. 25% shield damage resistance reduces the amount of damage to shields by -25%). So 35% from 125 Shield Power +20% from [DMGx] attribute would be -55% damage to shield.

From your example, 35% (power) + 41% (max EPtS III) alone would put you over the 75% cap. I think Maxed TSS II is 28% and the Shield attrib +20 would put you at 134% Shield Damage Resistance. Overkill
Lt. Commander
Join Date: Dec 2007
Posts: 120
# 3
06-25-2011, 10:53 AM
Awesome! This is exactly what I wanted to know. It might be worth mentioning that this info would be useful for hardening shields on an escort that does not have access to the higher level EptS abilities.
Lt. Commander
Join Date: Dec 2007
Posts: 120
# 4
06-25-2011, 01:15 PM

The way damage reduction for shields works is that each source of damage reduction is its own multiplier to damage, and they are all multiplied with the damage.

So, 30 % shield resistance means a damage multiplier of 0.7 . 15 % shield resistance means one of 0.85.
30 % + 15 % => 40.5 % as .7 x .85 = 0,595 damage multiplier which equals a resistance of 40.5 %

In addition to that there is simply a cap that ensures the damage multiplier never goes below 0.25 (meaning 75 % damage reduction).

Lt. Commander
Join Date: Dec 2007
Posts: 120
# 5
06-26-2011, 04:15 AM
Quote:
 Originally Posted by Joseph.B This might be one of those questions for some of the STO number Guru's such as BigRedJedi, but I was wondering if anyone knew how the 20% damage reduction tags in shields were applied when running shields at maximum resist? IIRC the current maximum shield resist attainable is 75% (could be wrong), but how does stacking that with a shield with say a [pha] tag affect this max number? For example: With 125 shield power + EpTS 3 + TSS2 getting the max shield resist value is possible, but if I'm using a Covarient MX XI shield with [Pha] [Dis] [Pol] does that extra 20% resist value get factored into the resist calculation when attacked by those weapon types? I've read a lot about calculating shield resists but I have found very little about how the reduction tags are factored in overall shield damage mitigation. Thanks! -JB
Well, MustrumRidcully has covered the nuts 'n bolts of 'how' SDR is calculated, so I thought I would throw out a few examples, to supplement his explanation and offer some illustration:

Using a typical (tank) Cruiser (50-75 SPL-slider setting) as the baseline example:
• Baseline (assume all additional powers are in addition to running the following): EPtS3 (30% SDR, .7 modifier) + 125 Shield Power Level [SPL] (35% SDR, .65) = 54.5% SDR, .455
• Add TSS2 (~22% SDR, .78) = 64.5% SDR, .355
• OR Add RSF (if Engineer, ~40% SDR, .6) = 72.7% SDR, .273
• Add both = 75% SDR, .25
• OR Receive XS1 (`20% SDR, .8) = 63.6% SDR, .364
• etc.

Then, just to compare the baseline for a typical Escort (25 SPL-slider setting):

EPtS1 (18% SDR, .82) + 75 SPL (21% SDR, .79) = 35.2% SDR, .648

Finally, a typical Science Vessel (50 SPL-slider setting):

EPtS1 (18% SDR, .82) + 100 SPL (28% SDR, .72) = 41% SDR, .59

For your specific question, about the [X] Damage-type tags, if you receive damage from a source that matches your Shield's specific [X] tag, you gain an additional 20% SDR, .8 modifier, which is included in the SDR formulaic calculation.

As always, if there are further questions, we will be happy to help,
-Big Red
Lt. Commander
Join Date: Dec 2007
Posts: 120
# 6 <pop>
06-27-2011, 02:00 PM
From my brain's combat log:

MustrumRidcully and BigRedJedi's STO knowledge criticals your mind for 2.2 trillion damage. Ok now that that's out of the way, based on the examples you both provided, am I correct in my math:

125 Power Level [SPL] (35% SDR, .65) + EPtS1 (18% SDR, .82)

.65 * .82 = 46.7% SDR, .553

.553 * .80 = 55.7% SDR, .442

Straight additive lazy person math based on adding the percentages would lead a player to believe that their defenses are actually greater than they are in reality. Does this seem right to both of you?
Lt. Commander
Join Date: Dec 2007
Posts: 120
# 7
06-28-2011, 05:38 AM
Quote:
 Originally Posted by Joseph.B From my brain's combat log: MustrumRidcully and BigRedJedi's STO knowledge criticals your mind for 2.2 trillion damage. Ok now that that's out of the way, based on the examples you both provided, am I correct in my math: 125 Power Level [SPL] (35% SDR, .65) + EPtS1 (18% SDR, .82) .65 * .82 = 46.7% SDR, .553 Add Your Shield Choice [Pha] (20% SDR, .80) .553 * .80 = 55.7% SDR, .442 Straight additive lazy person math based on adding the percentages would lead a player to believe that their defenses are actually greater than they are in reality. Does this seem right to both of you?
For .65 * .82 = 44.7% , .553 (Remember, to calculate %'s, take [1 - Multiplicative SDR decimal value] * 100 = X% ... Thus [1 - .553] = .447; .447 * 100 = 44.7%)

I'm getting: .553 * .80 = 57.4%, .426

So, you're in the right ballpark.

And, yes, many, many players assume that they have much greater defenses than they probably do, because they don't entirely grasp the mechanics of how SDR is calculated.

Additionally, this illustrates that it is actually rather challenging to reach the SDR cap of 75%, .25.

Hope that helps,
-Big Red

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