[ANNOUNCEMENT] Heroes 3: World Tournament - an add-on for tournament games.

It says that if, for example, the level of Wistan is higher than 6, then he gives a bonus of 6 lizards per week. Is this true? If so, does he have to be in the castle at the end of the week, or is it not necessary?

It is not necessary. The mere fact that you have such a hero on the map is enough.

If the hero is in a tavern at the beginning of the week (because he was moved during the turn), then there will be no bonus to the growth.

Bonuses from multiple specialists (only Flax has this) are cumulative.