Crowbar

The Crowbar is a melee weapon. It is a unique weapon which deals critical hits right after destroying a door or hitting a specific "bestial" type enemy.

Location
The blueprint for the Crowbar is located in a secret area behind a special lore room where a scientist's corpse with a headcrab resides, along with that of the HEV Outfit. The room will always spawn unless both are collected and turned in to the collector.

Synergies

 * The can be used to guarantee critical hits with the Crowbar even when there are no doors available, such as in boss biomes. Since the skill has a 10s cooldown, without any cooldown Mutations it leaves a 2 seconds window where the Crowbar won't deal critical hits before a new door can be deployed.

Trivia

 * Along with the HEV Outfit, the Crowbar is a reference to the Half-Life series as the iconic melee weapon used by the protagonist Gordon Freeman.
 * Before v1.8, this weapon was teased in the game as an easter egg in the background of Weapon Merchants.