A weapon fatality is basically a combo with the weapon the character uses. At the end, blood sprays and your opponent falls to the ground. The message "WEAPON FATALITY" then appears. The weapon fatality must be earned and is not available until it is unlocked. This fatality is also character specific, meaning each character's weapon fatality must be unlocked to use it. This requires unlocking them in Koffins or completing survival mode thirteen times.

Scorpion: Press Up, Down, Kick.
Johnny Cage: Press Up, Down, Kick.
Sareena: Press Down, Up, Kick.
Reptile: Press Up, Back, Kick.
Nitara: Press Down(2), Punch.
Hsu Hao: Press Up, Forward, Punch.
Bo Rai Cho: Press Down, Back, Kick.
Quan Chi: Press Down, Forward, Kick.
Drahmin: Press Down(2), Kick.
Mavado: Press Down, Back. Kick.
Shang Tsung: Press Back(2), Punch.
Raiden: Press Up, Down, Kick.
Cyrax: Press Up(2), Punch.
Sektor: Press Down(2), Kick.
Noob Saibot: Press Up, Back, Kick.