Unstable Inventor Question

[3 Crows Witch]

I'm making an inventor for the 1st time & I have a question how the Unstable ability works.

Per the rule:
When you take an unstable action, attempt a DC 15 flat check immediately after applying its effects.

I am currently a Master Crafter with a +18 crafting skill.

Does this mean I will never fail the Unstable flat check or do I still fail on a roll of a 1?

Thank you to anyone who can give me guidance.

[Errenor]

Flat checks are just raw d20 rolls without any bonuses. (Unless there is some specifically written for it probably, but I know none)

[Super Zero]

It's a flat check, not a Crafting check. But yes, a total of 19 with a natural 1 fails a DC 15 check. That's just the normal rules for checks and natural 1s and 20s.

[3 Crows Witch]

Errenor wrote:

Flat checks are just raw d20 rolls without any bonuses. (Unless there is some specifically written for it probably, but I know none)

Got it - thank you both for the clarification!

[pauljathome]

I'll note that a fairly common house rule is apparently to make the failed unstable check only disable that particular check (so, if you failed on explode you could still use Blast Boots, for example).

Never seen this myself but many people claimed that it was a good rules change, bringing the inventor up from worst class in the game to somewhere in the middle of the pack (still nowhere near top of the pack, mind).