I thought I'd ask this before wasting a valuable invisibility potion. It is my understanding that the healing bags are non-magical (based on your Heal Skill ability). So when invisible, does administering the healing bag goo on yourself or another take you out of invisibility?

Invisibility is broken when you attempt to harm someone. Healing, as far as I know, is not harmful.

This is a good question. The healing bag item has a "unique power" -- I do not know whether using a "unique power" breaks invisibility in the NWN game engine. If it does, then using a healing bag will break invisibility; otherwise, it won't. There isn't any special scripting to make it break invisibility, as it isn't a hostile action.

No it does'nt break invisibility.

Splendid! Thank you Naga.

For the record, you can even stay in Greater Sanctuary and heal yourself if you're really paranoid :)

Healing bags also do not funciton if you try to heal an invisible person that you can't see (only hear), which is the way it should be, as far as I know.

that go's for any other ability, spell, feat as well unless its got an area of effect.

not sure about whirlwind attack though.

Are you sure you can use heal bags on someone who is invis? I could be mistaken, but I am pretty sure I've made people invis, they simultaneously go to 0 hp then they die because no one can heal them.

the only way you can heal someone who is invis, is by using spells to see them or haveing some natural ability that allows you to see invis.

ExileStrife Healing bags also do not function if you try to heal an invisible person.