Build Guide by ELAKtheMAD
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Not Updated For Current Season
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karthus mpen build
Really love this Hero (villain)
wanted to make a guide (hopefully it hasn't been done already)
The skill build is a little weird, i know. give it a chance, it reflects on the fact that your items will help you build Mpen (magic penetration) at the beginning. i just grab as much dmg with my spells as i can, using the *** (wall of pain) to slow my prey down so i can hit them for additional dmg (d'uh). also i have exhaust which slows so thats why i pick *** later then sooner.
Because of this builds expensive high tier items i chose teleport to get in the fight sooner than later and zip around the map to maximize his farming ability.
since there isnt any seal's that do MPen, i decided to go with dodge, every hero should have some dodge. you can replace it with whatever you wish from seals.http://www.mobafire.com/css/gfx/full-top.png
heres the math behind the build
+20 MPen from Sorc. boots
+20 Mpen from Guise
+19.35 Mpen from runes
59.35 mpen flat
+40% mpen from void staff (so at 100 MR -magic resitance- we have 40 Mpen)
so in total we have
59.35 + 40 = 99.35 Mpen flat + scaled mpen
-20 from abyssal scepter
-10 from upgrade exhaust
-35 from Wall of Pain
-65 is your total MR reduction
Ability Power (AP)
+25 from guise
+70 from void
+70 from abyssal
+50 from base rod of ages
(+30 after 15 minutes of have ROA)
+45 from base archangels staff (ARS)
(+10 ap from base mana on ARS)
for a flat Ap bonus of
then because you have archangels staff you have to factor in that 2.5% AP
since Karthus' lvl18 mana is about 1300
and then you add 1000 mana from archangels ability
then add another 1000 from ROA
for a approx total of
3300 mana late game
then just compute...
3300 * 2.5% (0.025) = 82.5 AP
add that to your ap already
vs. your abilities this equates to
Q: Lay waste; 120@lvl5 (+118) dbl that on a single target = 476 Mdmg
E: Defile; 110 dmg/sec (+84.375) = 194.375 dmg/sec
R: Requiem; 550 dmg (236.25) = 786.25 dmg
this may not seem like much but when stacked with massive MR bypass, your always doing your dmg umitigated which is by far the most mind boggling part.
p.s. you psych your opponent out of the gate since you already make 19 of their mr non existant. they may look at your items and wonder why are you doing so much dmg. with this build im sure you will make a nice collection of kills with little to no resistance.
PPS this build will take skill and patience, succumbing to death to often or being absent at ganks seriously compromises your ability to fulfill the potential of this build. so you must stress defence and team work above all else.