Flint is a warhammer-type meleeweapon, which sends out a flaming trail that ignores shields and deals a critical hit to enemies in melee range when charged.
"All attacks are fully charged without needing to hold the button."
Synergies
Parrying with the Rampart allows to safely charge up the flint.
The King Scepter can be used to provide significant airtime, allowing for safely charging the flint.
The powers Grappling Hook and Phaser can be used whilst holding the flint without cancelling it's attack, essentially storing the charge to release at a later time.
The shockwave produced by this weapon's charged attack is considered a ranged attack and is therefore affected by ranged mutations such as Point Blank.
Notes
Prior to v1.9, the Update of Plenty, its combo rate was 0.9 (0.6 + 0.3).
The flaming trail does not inflict burn, but it can ignite oil.
Can destroy ram rune floors with charged attacks if the player has acquired the ram rune.
Trivia
This weapon appears to be one of Concierge's detached hands stuck on a shaft, thus the flavor text "give an extra hand", and it mimics his ability to launch a flaming trail at the player.