Talk:Abyssal Mask/@comment-15675781-20181019234258/@comment-29964258-20181206030728

Alright time to pitch in. I like nice even numbers like double slap, so we're gonna go with 1k raw damage, and increments of 50, 100, 150 MR, as well as increments of 0, 25, 50 MPen.

50MR-0MPen 1000 * 100/(100+(50-0)) ~ 666.67 damage * 1.15 = 766.67. plugging this back in, we get 766.67 =1000*100/(100+(50-X)), ---X= (1000*100/766.67) -150 = -19.5657 so this has the same result as having 19.57 MPen. (for the future I won't write out all that, i'll just do it).

50MR-25MPen

800 damage, goes to 920, an effective 41.30 MPen, or an extra 16.30

50MR-50MPen

1k damage, to 1150 damage, infinitely better than MPen can get you (MPen can't make it do bonus damage)

100-0

500 Damage, to 575, equivalent to 26.09 MPen

100-25

571.43 damage, to 657.14, equivalent to 47.83 MPen or 22.83 extra pen

100-50

666.67 damage, to 766.6, equivalent to  69.56 MPen or 19.65 extra (looks familiar)

(It was here where I conglomerated everything into one equation where X=effective MPen)

X = - ((100+MR-MPen)/1.15  - (100 + MR))

150-0

effective 32.61 MPen,

150-25

effective 54.35 Mpen, or 29.35

150-50

effective 76.09, or 26.09

So easy conclusion, the effective MPen of Abyssal Mask is based entirely on the difference between their MR and your MPen. The equivalent MPen is larger the larger the gap. So my take on this is that Abyssal Mask is more effective at increasing damage the less MPen you already have, However, Abyssal mask does always increase damage. However, if the difference between your MPen and their MR is less than a certain point, it is more useful to buy more MPen. However, given that that small of a gap is pretty much going to require some other way of closing that gap such as wit's end or corki's E, and if you are buying Pen you probably aren't the one holding the Mask, it's still good