Here is a bit more information on my previous post:
https://www.project1999.com/forums/s...&postcount=214
Looking at the data, going from 100 AC to 200 AC reduces damage taken by ~11000 on the Shadowknight.
However, going from 200 AC to 300 AC only reduces damage taken by ~5800 on the Shadowknight.
People may be wondering why going from 200 AC to 300 AC has significantly less benefit.
The reason for this is the AC mitigation formula isn't a linear equation:
1. ~10.5 D20 Damage Roll Average occurs when the Defender's Mitigation is equal to the Attacker's Wrath.
2. ~6.5 D20 Damage Roll Average occurs when the Defender's Mitigation is 2x larger than the Attacker's Wrath.
3. ~4.0 D20 Damage Roll Average occurs when the Defender's Mitigation is 4x larger than the Attacker's Wrath.
In the Shiel Glimmerspindle tests, I only need somewhere between 100 AC and 150 AC to get to the point where her Wrath was equal to my Mitigation. Looking at the data, I think that value is somewhere around ~125 AC. This means that past ~250 worn AC (Mitigation is 2x larger than Wrath), you will see diminishing returns even if your AC softcap is 300 or higher in this specific fight.
On a higher level mob with a larger Wrath value, I would need more AC to get to the point where my Mitigation is equal to the mob's Wrath.