- There are known formulae for Defense, Shield, and Absorb
- There are differences in the stat budgets between Legendary 52 Enhancements and Advanced ___ 54 Enhancements. For example, a Sturdiness 52 enhancement contains 146 Endurance, 231 Absorption Rating, and 161 Defense Rating. An Advanced Bulwark 54 enhancement contains 183 endurance, 220 absorption, and 104 defense. An Advanced Vigilant 54 enhancement contains 220 endurance, 208 absorption, and 62 defense
- There are differences between the legendary "optimized" 52 enhancements, the "single"-high endurance 52 enhancements, and the "double"-high endurance 52 enhancements. Sturdiness 52 contains 146 Endurance, 231 Absorption Rating, and 161 Defense Rating; Bulwark 52 contains 192 Endurance, 231 Absorption, and 110 defense; Vigilant 52 contains 231 Endurance, 218 Absorption, 66 Defense. So I refer to Sturdiness as optimized, Bulwark as single high endurance, and Vigilant as double high endurance. Single high endurance only sacrifices defense rating, but double high sacrifices both defense and tertiary.

So questions boil down to whether using the higher health enhancements is superior to the optimized legendary 52 enhancements, and which high enhancement to use, the single or the double.

By using the known formulae, and the differences in the stats for each enhancement type, I have computed the end chance percentages by stacking an entire suit's worth of the enhancement in question. Naturally, that is not optimal, but for working out the "_____ Chance" totals I wanted a number closer to the whole stat budget, to see exactly where we might be on the diminishing returns curve. For example:

- A full suit 7-enhancements worth of Immunity 52 mods would be 7 x 231 or 1617 Shield Rating
- If I then add on the gold Gemini MK-5 earpiece and two implants, lets also assume bastion implants for shield rating, that brings my total SR to 2310
- If you use the formula to convert Shield Rating into Shield Chance, that result is 28.73%(rounded down)
- Naturally this does not take into account augments and shield chance on relics. Fortunately, the dps relics are generally considered better, the rating 240 augments only have 3 more tertiary than the 228s, and there is no defense rating on the 240 or 228 augments. So, this increases the SR by 14*96 or 1344. Accounting for a full suit's worth of augments for shield rating, my new shield chance is 37.06%

Doing the same for a full suit's worth of Adv. Bastion 54 and Adv. Steadfast 54 enhancements yields 36.69% and 36.27% respectively.

For the record, changing 7 enhancements from Immunity 52 to Adv. Steadfast 54s increases endurance by 518. So, I am basically trading 0.79% shield chance for 5180 health. On face value, that seems like a reasonable tradeoff.

However, I went onto Parsley.io to see if I could examine some parses of a Shadow/Assassin tank in Veteran Mode Gods of the Machine.

This was a sample parse I looked at. In KBN's

famous, but outdated thread, he discusses mean mitigation theory relative to incoming damage profiles. Fights with high amounts of melee/ranged damage will presumably benefit more from higher defense chance, because only melee/ranged attack types can be defended. He cites Malaphar, Underlurker, Bulo, Torque as examples of fights with high M/R damage (presumably because that thread was composed during the 3.x era). If I am reading that parse above correctly, then the incoming damage profile of the VM GOTM operation would look like:

- Tyth, 83.46% attacks potentially defendable
- A/E, 79.95% attacks potentially defendable
- Nahut, 60.63% attacks potentially defendable
- Scyva, 86.52% attacks potentially defendable

Now, I may not be interpreting that parse correctly. However, if I am, then the incoming damage profile for most of the VM GOTM operation would qualify as high M/R.

So, how much defense chance am I losing by going from, say seven Immunity 52 enhancements to Bastion to Steadfast? Assuming I'm using the fortitude stim, and assuming I have all Lethal B mods, my defense chance drops from 17.90% to 13.95%, a loss of 3.95% defense chance. If incoming M/R damage profile is high, that could be a significant loss. Naturally, switching to legendary gold Steadfast 52's would mitigate some of the penalty of Advanced Steadfast 54s. Similarly, using Adv Bastion 54s would result in less defense loss, but doesn't result in as much of a health boost. Its 259 endurance for a 2.15% loss in defense chance. Taken altogether, on average its like 1200 health per percentage point of defense chance I exchange. Is that a lot?

When you are talking about an attack that is highly defendable, for example, Scyva's Destroy, which did an average of 5.9k on that parse, it seems like taking 1% fewer of those attacks is more than offset by the extra health. But is that truly the case? In fights with high M/R incoming damage, is it better to have the defense rating from all those Warding B mods, especially if using the double-high endurance enhancements? Its 1314 defense rating, which is nearly 5-7% defense chance. 7% of 5.9k damage is 413 damage potentially avoidable, versus 1314 power which adds a certain amount of bonus damage to my attacks, 0.23*POW or an extra 302 damage per attack.