The special thing about Maple Saint Weapon?

It says "Add Stats per Character Level". How exactly does it add?
It also says "weapon attack: 1.0 x 70" What is this? How about the weapon attack above that? That is just so confusing.
Can anyone help plz??

The 11th Anniversary weapons are a new type of equipment called Custom Equipment. These items gain stats based on your level (until a certain level) and are treated as a different level when scrolled, enhanced, or potentialed.

The 11th Anniversary weapons are treated as level 100 but have the required level 30. The Shining Rod for example gets 0.8 x your level in weapon attack and 1.3 x your level in magic attack, up to a maximum of the different between the ‘actual level’ and the ‘required level’. Anyone above level 100 will have the maximum stat gain of 0.8 x 70 and 1.3 x 70.

From Orangemushroom blog.