Use
Call of the Void first in your combo Rud, so they can't flash out or use an ability like Shunpo to get out before you ult them.

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late game i always miss
Call of the Void from the target i'm focusing... but try to use it to get more champs as you can and silence that casters champs. or wait until someone use an ult that can be canceled
Warwick
Galio
Katarina
Tryndamere etc...
Null Zone put if under your target, simply as ****
Malefic Visions spam it, preferencially on low MR enemies or your target
Nether Grasp Wait until someone of them get in a bad position, stay always a little behind your tank, or get them from behind,
Call of the Void
Malefic Visions
Null Zone
Nether Grasp if you hit malefic and the ult above null zone, with 1, maybe 2 voidlings, you should kill it, if squishy...
your problem probally is positioning












your problem probally is positioning

You should never dive past enemies in order to use your ulti, you can even use your ulti right at the start in order to melt their tank if you think your team can do enough dmg. Blowing up an ammumu before he can ults is a lot more useful then tunneling their carry ;)
Your Ulti will make you primary target, every time. I use my three abilities in a teamfight and only ulti to interrupt someone, such as WW or another Malz suppress, aoe channels, things like that. Otherwise, my Ulti's used to save my skin or someone else's if they're being chased, and for ganking someone OOP. If you're doing really well, use it for the lulz, but if it's a close match, your range on your other abilities allow you to effectively teamfight and silence without getting you killed. The enemy team tends to ignore me until I ult, then I'm the center of everyone's attention. Save it for important stuff or even support tasks, don't spam it or feel like you have to use it. You can use it to burn someone down quickly, or take out Tryndamere, hard to rage away when you're suppressed. Even if it doesn't kill him, a quick visions and he'll usually DoT to death.
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