Karthus the forgotten King
Karthus used to be in the pro leagues as a top tier mid laner but now he has been down graded to a has been.

Thees champions now rule the mid lane and supports get a buff. But Karthus who is heavily ap dependent is hard countered by

Karthus can no longer get 1450 ap and lacks utility. I believe he needs a boost.
His ult used to do 70% now it dose 60 and the wall no longer gives 35 pagic pen at max level only 15.
You can only get 1070 ap with 35 bonus ap from masties and runes.
he has low health and is relient on his q that is mana dependent.
his E with blue buff will take your mana to zero in no time and he has low sustain in the erly game.
He is good but compere him to champs with heals and magic resist like

and he is found lack in utility. Yes has a globle ult 250, 400, 550 +60% ap with a long cool down and his Q only dose base level adc damage unless you hit a sing target his aoe is also week and as a pasive only give you mana on kills and thet is only 48 at max you use 88 each Q max.
So if Karthus farms and is able to keep his distance he can sustain but is reliant on teem support in using his ult and if the team is doing relly well he may never get to us his ult to any effect.
Just like the wall that dose no damage Karthus is missing something to make up for certain falls in the mid game and damge.
So I would like the to and a stacking passive to the wall or defiled.
passive each kill give you a stack, max 5, each stack gives 1,2,3,4,5 per cent spell vamp and magic resist 5% 10% 15% 20% 25%.
Active when you us the wall or toggle on defiled he gets bonus % of ability power to all abilities util the wall falls or untill you toggle off defile. You then loose all stacks and you loose all stacks if you die.
I think this would be a nice revamp to an old champ and would allow him to returen to the pro seen.
I would help to prevent early game magic resist shut down and help give karthus back some damage.
I would increase his skill cap suitability and would not make him over powered.
with max stacks and having defiled on you can have 55%/75% Q 55% E and 75% R
This could be redused to only 0.5, 1, 2, 3, 4 Q.
I know the ult seems op but late game if it doesn't kill someone life steel usually negates the damage.
I just hate hard counters like swane and war wick to champs that go from decent to bad.
