The Burnt World of Athas
Skillz are basically everything that you character can try to do.
Bluff- “I totally didn’t rob that guy, please ignore the unconscious guy.”
Spellcraft- “FIREBALL… oh crap.”
Spot- “What elv—”
Hide- “They’ll never find me here…”
And all sorts of other stuff. You roll a d20, add your modifier, and see what happens.
For a list of skills, look at this! SKILLZ