Suppose a situation in which my character is currently at 10 HP out of a maximum of 20 HP. If my maximum HP is reduced by 10, do I also lose the 10 current HP I have?
Situation 1. The answer found here - What happens to the current hit points when Aid ends? - seems to indicate that my current HP would remain at 10 (keep in mind I want a general answer, not specifically for Aid).
Situation 2. When I read the PHB page 177 concerning Hit Points, I see that:
If your Constitution modifier changes, your hit point maximum changes as well, as though you had the new modifier from 1st level.
Which implies to me that if my hit point maximum were to change due to my Constitution score being reduced, then I have effectively taken 10 damage as if my hit points were actually 10 from 1st level (like a ret-con).
If my reading of Situation 2 is correct and that is how it works upon Con score reduction, then would this situation apply for any loss of maximum HP, such as with a Wraith?