Becoming the Monster

[Anthrowhale]

Faerie Mysteries Initiate lets you use your Int instead of your Con for hit points. Great for a typical wizard, but not a Green Star Adept - you have no Con bonus to use your Int instead of.

Looking here

The modifier for a nonability is +0.

so GSA 10 implies a constitution modifier of +0.

FMI says:

...use your Intelligence modifier instead of your Constitution modifier to determine bonus hit points.

So, nonabilities have ability modifiers (of +0) and FMI swaps ability modifiers (not bonuses).