How do I deal with karthus jg?

Karthus is bad at dueling, especially so early, and his early ganks aren't great either. He may try to cheese mid w/ his wall slow and redbuff ~ lvl 3, but you can countergank that and generally win the 2v2.

Also, karthus 2 favorite camps to do are raptors and krugs, and he also wants his blue buff everytime.

So as said in the previous comment if your lanes are winning or even enough that the enemy laners can't join: Invade invade invade. Karthus is a scaling champ so as with all scaling champs the best strat is to punish him early so that by the time he comes online the game is already lost.

{quoted}

Hey, the title says it all, I just struggle against him a lot any help would be appreciated.

invade him with someone like Xin, Vi, or J4 and fuck. SHIT. UP.

Hope you have winning lanes that enable you to invade and abuse him before 2 items

he loses 1v1 to pretty much anything early so try to contest scuttles and if ur lanes have prio try invading

Umm rengar counter jungle him