Harrowed / Augment Summoning and 0 attribute creatures?

[Murdock Mudeater]

As title, If I summon something normally with a dash attribute, and the feat modifies that attribute, what happens?

In particular, planning to summon mindless undead via skeleton summoner feat.

[Dave Setty]

A '-' isn't the same as a 0 attribute - the creature doesn't have that ability at all. So you can't add to it.

[andreww]

What he said.

[shadowkras]

If you cast bear's endurance on a skeleton, the spell simply has no effect at all. It doesn't fail, it simply won't do anything.

[Murdock Mudeater]

Thanks.

[Murdock Mudeater]

Was getting confused because of the rules for Vermin companions losing mindless when they get INT boosts.