User blog comment:HeroGaming/Karthus Overextend or not to Overextend?/@comment-3450702-20120216143806

Yes and no. If you look at xPeke's last year's Dreamhack preformances, you'll see he often flashed in and died, but his team CC (Alistar, Ashe, Sona, Amumu and other champs as well) kept the enemies in his E and Q, and we even saw several 1 for 4 exchanges where only the enemy support survived, or the tank, basically losing the game. On the one hand your passive shouldn't be PLANNED on, on the other hand if it's you or your AD, or even you or your bruiser, you might want to think if you really would help the fight much hiding behind your tank. Also don't forget, with rylai's you slow them down when on top of them, keeping them in longer.

Overall, Karthus' passive should never be neglected, but neither should it be your primary tactic. Utilize it, and utilize it wisely, and you will be awesome.

On a side note, Karthus bot is fucking sick shit.