The description of the stone of good luck (or luckstone) says:
While this polished agate is on your person, you gain a +1 bonus to ability checks and saving throws.
In layman's terms, does the luckstone just give a passive +1 to all d20 rolls and saves except for death saves?
Because as far as I can see, all almost all d20 rolls have an ability tied to them to make a check or opposed check. The only one I can think of that does not use an ability with the d20 roll is death saves.