Slasher

You've learned where to cut to have the greatest results, granting you the following benefits:

• Increase your Strength or Dexterity by 1, to a maximum of 20.
• Once per turn when you hit a creature with an attack that deals slashing damage, you can reduce the speed of the target by 10 feet until the start of your next turn.
• When you score a critical hit that deals slashing damage to a creature, you grievously wound it. Until the start of your next turn, the target has disadvantage on all attack rolls.

name = 'Slasher'
description = "***Feat: Slasher.*** You've learned where to cut to have the greatest results."
def prereq(npc): return True
def apply(npc):
    chooseability(npc, ['STR', 'DEX'])
    npc.actions.append("***Attack: Slasher.*** Once per turn when you hit a creature with an attack that deals slashing damage, you can reduce the speed of the target by 10 feet until the start of your next turn. When you score a critical hit that deals slashing damage to a creature, you grievously wound it. Until the start of your next turn, the target has disadvantage on all attack rolls.")