A video showing the Chainsaw weapon type and some of its abilities.
Chainsaws are loud, rapid-fire melee weapons. Due to their not requiring ammo to hit multiple times a second, Chainsaw attacks can last a long time, provided the target doesn't move away. As such, it is best if the Chainsaw user can redirect enemy attention towards them and use a full Defend Bar for increased damage and defense over the prolonged attack period.
Customizing a character or a Chainsaw to utilize Stun Competencies can cause stunlock on an enemy and is invaluable in boss fights.
Competencies shown in the video include:
Phenomenon Flare - User sacrifices their Chainsaw to deal large Fire damage around themselves. If you plan on using this ability often, a character could be customized with an inventory full of Chainsaws. Dual Chainsaw - User can dual-wield Chainsaws, dealing double damage and using double Weapon Mods. Buster Saw - Chainsaw deals double damage and inflicts additional damage for each enemy adjacent to their target. The Chainsaw blade's size also increases. Cut Deeper - Chainsaw attacks increase in damage the current rapid-fire goes on for. Combo Saw - Chainsaw attacks boost the Unarmed Combo Modifier, but does not utilize it. Deflection - If an enemy attacks the user while the user has a Chainsaw equipped, the enemy is damaged, as well. Stealth Saw - Chainsaw attacks utilize the Combat Knife's innate backstab and stealth damage bonuses. Backstab Boost Competencies also apply to the Chainsaw in this instance.