Quote:

**Almight Aza**:

Say someone has 100 MR, which I think is ~40% resist but assume it's 50%, if you deal 100 magic damage they will receive 50 damage, if you have 20 Mpen it will take their MR down by 20 points and so they will have 30MR lets assume it's 30% reduction and you'll deal 70 damage. Does that answer your question?

Also gotta remember that MR and armour have diminishing returns as in if you add 10 to your current 20 armour, it will give you a larger % resist, and if you have 100 armour and you add 10, you'll get a MUCH smaller amount of resist. The same effect with Mpen and Apen

Close enough, but not accurate.

The exact formula for armor and MR is 100 - 100/(100 + value) reduction.

This means that 100 armor is exaactly 50% reduction, 200 is 66%, 300 is 75% etc

While saying that the first 10 armor will give you more % reduction than an other 10 armor when you already have some is true, armor and magic resist don't have diminishing returns in the proper sense of the word. If you take a closer look at the formula, you will see that

**Every point of armor increases your effective health by 1% against physical attacks**
Which means that every point is equally valuable, in a way. Let me demonstrate this concept.

If you have 1000 hp and 100 armor, this means that you have 100% bonus effective health, thus it will take 2000 damage to kill you. In other words, 50% reduction.

If you have 200 armor, this means 200% effective health, thus it will take 3000 damage to kill you. For 300 armor it's 4000 and so on and so forth.

In other wors, without knowing the exact % reduction, with 57 armor you can still know that it will take exactly 1570 damage to kill you.