The "AI increase total allowed hero count" mod for Heroes III Era.
Description:
The Heroes III game has two limits of maximum hero count that AI may hire.
Limit 1: AI does not hire a hero if there are already 9, 12, 15, 18 or 21 (based on difficulty level) wandering heroes owned by any player on the adventure map.
Limit 2: AI does not hire a hero if it already has 3, 4, 5 or 6 (based on difficulty level) heroes.
This mod changes the first limit. When the mod is enabled it increases the limit of hero count to 25, 34, 43, 52 or 61 heroes respectively.