Talk:Jarvan IV/@comment-76.29.173.54-20120120073058/@comment-75.133.147.122-20120122071613

With the exception of dodge and reduced movement speed, percentages work additively, like cooldown reduction and additional movement speed. Additionally, flat reductions work before percentages, meaning in essence that the flat reduction will be lower than the value shown on the item.

For example: Say the opponent has 100 armor and you use Dragon Strike to remove 26%, lowering armor down to 74 armor. Now add Brutalizer to that. That 15 armor reduction is applied first, so 26% reduction on 85 armor becomes 62.9 armor, an actual reduction of 11.1 armor, not 15. If you have one source of percentage based penetration, it's best to supplement that with more percentage based than with flat, as the flat penetration is lowered by what your percentage penetration would be [(15 - 11.1) / 15 = 26%]