Axeman

You’re a master of the axe and your heavy blows cleave
through your foes. The following benefits apply only to
the handaxe, battleaxe, halberd, great axe, and similar weapons.

 When you reduce a creature to 0 hit points or score a
critical hit with an axe, you can use your bonus action
to make a single attack with an axe.
 When the weapon damage die result of an attack made
with an axe does not show a maximum result, you deal
an additional 1 point of damage with the attack.