Never Axed For This
|The following is based on the JSawyer mod and has not been confirmed by canon sources.|
Minor bonus to critically hit with Hatchets, Throwing Hatchets, Tomahawks, Proton Axes, Proton Throwing Axes, Protonic Inversal Axes, and Protonic Inversal Throwing Axes.”
You can obtain it by dealing 1600 damage with axe-type weapons. You gain +2% critical chance (per rank) with the fire axes, Knock-Knock, hatchets, throwing hatchets, tomahawks, proton axes, proton throwing axes, and the inversal versions of those weapons.
Although not stated in the description as being eligible for the perk bonus, the fire axe and its unique variant Knock-Knock are actually affected by the perk.
Behind the scenes
This perk refers to the tagline of Deus Ex: Human Revolution's teaser trailer: main character Adam Jensen intones on how he 'never asked for this'.