Sorcerer Hag Blood Magic

[likrin]

The ability says “The first creature that deals damage to you before the end of your next turn takes 2 mental damage per spell level and must attempt a Will save.”

What does the Will save do?

[HammerJack]

It says "basic will save"

The word basic is important.

It means that it works like this:

Crit success - No damage
Success - Half damage
Fail - Full damage
Crit fail - Double damage

See page 305 or page 449 for this definition.