Talk:Olaf/@comment-5667385-20130308202326/@comment-108.69.69.78-20130312190555

Protip: 30 flat is better than 25% in most cases.

Assuming you have the 8% armor pen mastery, 25% pen doesn't break even with 30 flat pen until the target has 130 armor. If you have black cleaver or last whisper, or a teammate with an armor reduction skill, the break even point is even higher.