Grit, luck, and panache

[Amdy_vill]

"Grit, Luck, and Panache Grit, luck, and panache represent three different means by which heroes can gain access to the same heroic pool, using it to accomplish fantastic feats. For characters with a mix of grit, luck, and panache, they pool the resources together into a combined pool. (Those who use panache and luck gain twice their Charisma bonus in their pool.) For feats, magic items, and other effects, a panache user can spend and gain luck points in place of grit or panache points, and vice versa."

So i saw this when i was looking at swashbuckler and gunslinger. so i know what Grit and Panache are but i don't know what luck is. So what class does it come from or is it a feat/trait

[Kurald Galain]

i don't know what luck is. So what class does it come from or is it a feat/trait

There's an investigator archetype for that, i.e. the sleuth.

[Amdy_vill]

Thank you.