Hags are one creature that they did not execute as well in 5E as they could have, as the concept we have for them does not match up to their abilities.I give my hags the ability to Curse and Bless creatures, but not in combat. To do it, they need to spend 10 minutes in their home and have something, or someone, connected to the target in their presence. However, the target can be anywhere on the same plane.
A hag can Curse or Bless a number of people equal to their CR plus one per active Agony.
An Agony is inflicted when the hag can see that she has created extreme anguish in a person. As long as that person suffers, the Agony remains active. Often, the Hag encourages her victim to accept an Agony in exchange for a blessing or curse.
A Blessing or Curse is created by manifesting a wish verbalized to the Hag that changes one or more beings. The limits of the Blessing or Curse are up to the DM, but generally effect the memories, feelings and beliefs of a target. Generally speaking, a hag under CR 5 can only impact an individual, a hag of CR 5 to 10 can impact a small group, a hag of CR 11 to 16 can impact a large community, and a hag of CR 17 or above can impact the entire world. [Core rules do not have Any Hags in the later two categories, but I do].
The target of a Blessing or Curse gets a Wisdom Saving Throw equal to the Charisma Spellcasting DC of the Hag. If the Saving throw succeeds, the target is aware of the Blessing or Curse, but not aware of where it originates. They can then repeat the Saving Throw to avoid the effect. If they make the first saving throw (and become aware), but fail the second saving throw, they can repeat the Saving Throw at midnight, each night, to end the effect.
A Hag can use an action to perceive through the senses of a creature Blessed or Cursed by the Hag, as well as through the senses of anyone that verbalizes a wish that the Hag then manifests in a Blessing or Curse.
Whenever granting a Blessing or Curse, the Hag will attempt to twist it to create more anguish in order to grant her more power.
These curses are immune to Dispel Magic, but can be removed with Remove Curse or Greater Restoration.
Examples of Blessings: Removed the ability to feel fear, made them forget a painful memory, made them fall in love, raised an attribute to 15.
Examples of Curses: Took an eye, Unlucky, made someone hate, made somebody forget something (or someone), created a false memory, lowered an attribute by 6 (minimum 6).
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