Lacesaring Skirmisher

You have become specially adept at exploiting the positioning and mistakes of your foes, leaving them weakened afterwards, as any good rogue should.

• Increase your Dexterity or Constitution scores by 1, to a maximum of 20. 
• Whenever you reduce a creature to 0 hit points, you may move up to half your walking speed in any direction.
• Whenever a creature misses you with an attack or you take no damage from succeeding on a saving throw caused by a creature, you may use your reaction to do a single weapon attack against that creature, as long as they are within range. If that attack hits, the target must subtract a d4 from the next attack roll or ability check they make.