[Darkstone]

Not sure how novice or not the players here are, but here's an explanation in case;

The Worthy Heroes mod simply adds some better heroes to the selection , so you have greater variety in possible heroes, and it also buffs the existing heroes, usually adding an ability or item slot.

As for getting them, that hasn't changed. In case you haven't read that part of the manual, it's (X + 3)% chance per turn of getting a hero, where X is your luck scale. So luck 3 means 6% chance, and misfortune 3 means no heroes ever.