[Mod Request] Make Invoke Duplicity duplicate AC and HP equal to spell save DC

[Klonedio]

At the present a lot of people feel like this ability is kind of weak because it gets dispelled for nothing. Perhaps fixing bugs that dispell it upon casting a healing spell is a lot to ask, but hopefully this isn't.

So, as the title says: give the illusory duplicate some AC and HP to make it at least a little bit resilient.