Penetration Effectiveness Table

Reference table showing how penetration reduces enemy damage reduction across defense values.

Damage Reduction Formulas

Credits to osaka

Base Reduction
1 - 1000/(1000 + Defense)
Penetration Effect
1 - (Penetration/Defense)
Final Reduction
Base × PenEffect (min 0.3%, max 95%)

The exact formula and interaction between penetration and defense has not been officially confirmed by the game developers. However, the formulas used in this table provide a good approximation.

How to Read the Table

Rows: Boss defense values (what the enemy has)
Columns: Your penetration stat
Cell values: Final damage reduction % you'll face (lower = better damage)

0.3-15% Excellent15-30% Good30-50% OK50%+ Poor

Note: Damage reduction cannot go below 0.3% (minimum cap) or above 95% (maximum cap).

Boss Defense0
Pen
250
Pen
500
Pen
750
Pen
1000
Pen
1500
Pen
2000
Pen
2500
Pen
3000
Pen
4000
Pen
5000
Pen
6000
Pen
8000
Pen
10000
Pen
12000
Pen
Early Game Bosses (0-2000 Boss Defense)
00.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%
1009.1%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%
20016.7%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%
50033.3%16.7%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%
100050.0%37.5%25.0%12.5%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%
150060.0%50.0%40.0%30.0%20.0%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%
200066.7%58.3%50.0%41.7%33.3%16.7%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%
Mid Game Bosses (2500-4000 Boss Defense)
250071.4%64.3%57.1%50.0%42.9%28.6%14.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%0.3%
300075.0%68.8%62.5%56.3%50.0%37.5%25.0%12.5%0.3%0.3%0.3%0.3%0.3%0.3%0.3%
350077.8%72.2%66.7%61.1%55.6%44.4%33.3%22.2%11.1%0.3%0.3%0.3%0.3%0.3%0.3%
400080.0%75.0%70.0%65.0%60.0%50.0%40.0%30.0%20.0%0.3%0.3%0.3%0.3%0.3%0.3%
End Game Bosses (4500-6000 Boss Defense)
450081.8%77.3%72.7%68.2%63.6%54.5%45.5%36.4%27.3%9.1%0.3%0.3%0.3%0.3%0.3%
500083.3%79.2%75.0%70.8%66.7%58.3%50.0%41.7%33.3%16.7%0.3%0.3%0.3%0.3%0.3%
600085.7%82.1%78.6%75.0%71.4%64.3%57.1%50.0%42.9%28.6%14.3%0.3%0.3%0.3%0.3%
Rare High-Defense Bosses (7000+ Boss Defense)
700087.5%84.4%81.3%78.1%75.0%68.8%62.5%56.3%50.0%37.5%25.0%12.5%0.3%0.3%0.3%
800088.9%86.1%83.3%80.6%77.8%72.2%66.7%61.1%55.6%44.4%33.3%22.2%0.3%0.3%0.3%
900090.0%87.5%85.0%82.5%80.0%75.0%70.0%65.0%60.0%50.0%40.0%30.0%10.0%0.3%0.3%
1000090.9%88.6%86.4%84.1%81.8%77.3%72.7%68.2%63.6%54.5%45.5%36.4%18.2%0.3%0.3%
2000095.0%93.8%92.6%91.4%90.3%87.9%85.5%83.1%80.8%76.0%71.2%66.5%57.0%47.5%38.0%
3000095.0%94.2%93.4%92.6%91.8%90.3%88.7%87.1%85.5%82.3%79.2%76.0%69.7%63.3%57.0%
4000095.0%94.4%93.8%93.2%92.6%91.4%90.3%89.1%87.9%85.5%83.1%80.8%76.0%71.2%66.5%
5000095.0%94.5%94.0%93.6%93.1%92.2%91.2%90.3%89.3%87.4%85.5%83.6%79.8%76.0%72.2%
6000095.0%94.6%94.2%93.8%93.4%92.6%91.8%91.0%90.3%88.7%87.1%85.5%82.3%79.2%76.0%
7000095.0%94.7%94.3%94.0%93.6%93.0%92.3%91.6%90.9%89.6%88.2%86.9%84.1%81.4%78.7%
8000095.0%94.7%94.4%94.1%93.8%93.2%92.6%92.0%91.4%90.3%89.1%87.9%85.5%83.1%80.8%
9000095.0%94.7%94.5%94.2%93.9%93.4%92.9%92.4%91.8%90.8%89.7%88.7%86.6%84.4%82.3%
10000095.0%94.8%94.5%94.3%94.0%93.6%93.1%92.6%92.2%91.2%90.3%89.3%87.4%85.5%83.6%