Heroes 5.5 WarGame Edition - Tactical Edition.

Regarding the Temple of the Underworld, here's how I'm planning to implement it: The Temple of the Underworld requires at least a level 15 city upgrade and the presence of a Capitol – meaning it can't be built quickly, and strategically, it creates complications in that there can only be one Necropolis with a Converter. I want to place the Grail in the Castle branch – the Grail not only increases income but also growth; its connection to the Capitol branch is equivalent to its connection to the Fortification branch.