Loins of Legion
From The Heroes of Might and Magic III wiki
|Loins of Legion|
|Effect: This item, when equipped by a hero in a town, increases the growth of 3rd level units (in that town) by 4 per week.|
Increases your Town's Level 3 creature production by +4. Your hero has to equip it and be in Town (visiting or garrison) for the bonus to work.