potions...

look up "goofer dust" or "crossing powder"

Curses are rarely used to kill, apart from the morality of the event most practitioners simply lack the personal power necessary to see the curse through and kill someone. Potions on the other hand have a historical reference but they're not subtle things and I can almost garunteed that using it on anyone (including yourself) would be found out and is very much illegal, what you're basically asking for is a poison, almost all of which have been traced biochemically and we now know the causes if not the treatment for them. This type of potion whilst having magical origins is rooted very much in science.

"War water" "Death Water" look thiose up for starters.

Henbane infusion mixed with Asafoedita powder and Corpse powder was quite often poured where someone will walk or in their footpronts to ( magickaly ) poison them , cause them ill or even die.

Gooffer dust that Linda suggested can be a killing agent If used porperly, without ingestion of course

A suggestion You may dissregard is stay of "killing" or "death" spells, potions and rituals etc

Lost of luck
Bored

Why would you want to kill someone?

Three nights of hell,and Black widow curse really makes me evil.

Why would you make a fatal potion if poison works so well.

Don't forget the law of the three!

Kimmypot, not all people believe in the three-fold law. Also agreeing with Lindacash420, look into things like hotfoot powder and crossing powder etc.

Did I say go on and believe it?

You know I respect everyone's belief in this aspect.You don't need to tell me that.

I'm just suggesting and I don't need your opinion.

Kimmy, you actually did say go and believe it.

"Don't forget the law of the three!".

You said this as it was everyone's belief, maybe not literally, but that's what we get from you post, which is the reason witchykid felt like it was necessary to notify that not everyone believes in it. And it was certainly not superfluous!

I'm just giving a warning.
But ok.I may be wrong but.What I meant is that Karma may took effect in this certain activity.

Ok if you do or do not believe in the law of the three then don't.Do which ever you want.

I am glad that you understood your mistake ^-^