Highest AP build
I want to make a max ap item build because...karthus. that means just saying "veigar" IS NOT a valid answer In addition, it doesn't have to be particularly viable as long as it has the maximum AP thanks <3
I want to make a max ap item build because...karthus. that means just saying "veigar" IS NOT a valid answer In addition, it doesn't have to be particularly viable as long as it has the maximum AP thanks <3
just straight ap? 5 death caps and 1 spellbinder.

I think that's the maximum amount of AP you can get through items. Rabadon's Deathcap and Spellbinder both have 120 ap, but Spellbinder gives you 10% movement speed in addition to the 4 second 80 ap boost it offers, so it's usually better. One Rabadon's is necessary because of it's passive, Rabadon's Deathcrown is preferable because of the 175 ap. A fully stacked Mejai's gives you an additional 145 ap.
In total that's 1232 ability power.
At level 18 and with no other sources of mana,
gives Karthus 121.6 AP. With
and Manaflow Band, that becomes 135.1 AP. Add in the rest of your build, minus the Deathcrown upgrade and plus double Adaptive Force and 30 min Gathering Storm, that’s 1296.5 AP. If you swap one of the Spellbinders for a
, it becomes 1226.5 AP, which is a rather marginal decrease compared to how much the penetration amps damage output.
So, OP, if you’re looking for a build where you maximize the amount of damage your ult alone does, here you go:
. Don’t forget to pop the Spellbinder active at 100 stacks before channeling!
But if you want to do the most ult damage period, you’ll want to swap that last Spellbinder for a
and then go suicide into the enemy team. The damage amp is significant, and the %HP damage is also very strong through the shred from Wall of Pain + Void Staff. If you play it right, you’ll get your Mejai’s stacks back, too.
may i notice this stuff right , but you will need yuumi stuck on you , so you'll have +21% ap . so , my godlike build would be :

BUT there is another hidden build :
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dont forget manaflow + gathering storm , comet
If you want max AP (but an actual non-viable normal build) you use transcendence with the scaling CDR on a mana-based champion:

with transcendence gives 120 AP if I remember correctly but also gives mana to increase
's ability power from the passive.
One
for the active which you could potentially stack, use the active and swap it out for a
in the base.
Of course, if you actually want more damage (rather than just raw AP) you would actually want penetration:

Don't forget you would also want blue buff to get more AP from transcendence with this stupid build.
Highest Ap doesn't mean highest damage... you know, mr...
How do you get highest damage with karthus ult
See my response to DerMangoJoghurt’s comment.