Inequality

2nd-level enchantment

Casting Time: 1 action
Range: 30 feet
Components: V, S, M (a drop of blood and water, mixed)
Duration: Concentration, up to 1 minute
Class: Bard, Cleric, Paladin, Tamer

You twist the fates of two creatures you can see, both of whom must be within range. Choose one target to favor and one to disfavor. The disfavored target must succeed on a Charisma saving throw or the following effects occur:

• Whenever the favored target makes an attack roll or saving throw before the spell ends, the favored target can roll a d4 and add the number rolled to the attack or saving throw.
  
• Whenever the disfavored target makes an attack roll or saving throw before the spell ends, the disfavored target must roll a d4 and subtract the number rolled from the attack or saving throw.
  
• The disfavored target’s speed is halved, whilst the favored target’s speed increases by half.
  
  

These effects end for the pair if either of the target pair is knocked unconscious, killed, or the spell ends. While under the influence of this spell, a favored target can’t benefit from the bless spell, and a disfavored target can’t be afflicted by the bane spell.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can link two other creatures, favoring one, and disfavoring the other, for each two slot levels above 2nd.

Source: Heliana's Guide to Monster Hunting