First Blood

The First Blood achievement

“

First Blood! That was fast... Click to listen — The Administrator

”

The First Blood crit buff is gained when you are the first to kill an opponent in an Arena match. With the first blood buff active, all your shots will be critical hits for a total of 5 seconds. Your weapon will crackle with an electrical effect just like the crit buffs from the K.G.B. and Kritzkrieged weapons.

Damaging a Spy with his Dead Ringer activated still gives the attacker the First Blood buff.

Two Scout achievements involve the First Blood bonus. First Blood requires you to get the first kill in an Arena match, gaining the buff. The second achievement, First Blood, Part 2, requires you to kill 5 enemies with the First Blood crit buff active (These kills do not all have to be in the same round).

The First Blood buff counts as an Übercharge towards the Heavy achievement "Supreme Soviet"