Suppose a situation in which I am currently at 10HP out of a maximum of 20HP. If I lose 10 maximum HP do I also lose the 10 current HP I have?
Situation 1. The answer found here seems to indicate that your 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 your maximum were to change due to a loss of CON then I have 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 loss of CON, then would this situation apply for any loss of maximum HP, such as with a Wraith?