The Mockery's Law

You touch one willing, friendly creature or make a melee spell attack roll against a creature you can reach. On a hit, you alter a fundamental law of the universe for that creature. Select one option from the following:

• Gravity is altered for the creature. An ally gains a fly speed equal to their speed. An enemy has their speed reduced to a maximum of 10 feet.
• Momentum is altered for the creature. An ally's speed doubles and they no longer provoke opportunity attacks. An enemy who chooses to move must move their entire speed in one direction and provokes opportunity attacks from any creature they move adjacent to.
• The quantum state of a creature is altered.
  • An ally gains a duplicate who appears in a space next to them. Whenever they move, the duplicate can move as well and they can take actions through either.  If an attack roll or spell does not target both the ally and the duplicate, roll a d4. On a 4 the attack or spell misses.
  • An enemy gains a duplicate that appears in an adjacent space of your choice. This duplicate cannot move and when it takes damage the enemy takes that damage. If a spell or attack would target both the enemy and the duplicate, the attacker has advantage and the enemy has disadvantage on saving throws against that spell or attack, but the enemy cannot be hit twice by the same spell or attack.