Vol'jin a Witch Doctor that can kill enemy hero/heroes by using all his skill. Many of we know, we first use 1st skill, that 3rd and ultimate. Also buy a black king bar as well, to prevent enemy to disable you from casting ultimate......
However, there is other skill tat can even kill people in seconds, without using the ultimate.
Item used to back stab:Lorthar, dagger and force staff.
How to kill people without using ultimate:
1) Buy a Dagon for good (any level)
2) Make sure u have enough mana to cast 1st and 3rd skill
3) 3rd skill is maxed leveled......