Heroes 5.5 WarGame Edition - Tactical Edition.

Here's an alternative idea for the Temple. Block the interface of the undead converter (i.e., disable the standard functionality), but give it a different function: resurrect 100% of the player's lost ghosts, making them available for recruitment. This feature would also be useful for defending the city (let's not forget the defensive function -2 to morale), as armies located far away could use it to teleport ghosts to the city for a fee (dismissed ghosts - appeared in the city - bought them back).