UI management via scripts, spell casting callbacks, and other features.

Heroes 5 is a game from 2006 (and its development began in 2004); it was made for the budget hardware of that time. The game has 2 GB of video memory; if you have a modern video card that can handle 8 GB of video memory, it doesn't mean the game will use it. The game simply doesn't know how. So, if you run out of the allocated 2 GB of video memory while playing on a giant map... the game will crash.