[HoMM V]9 Race - Swamp! Is it needed?

To create a mod with a new faction, I need the source code of the Nivala game! That is, I need to see how Heroes 5 was written! And that's already a problem! For starters, I need to see what's in the file with the extension "data.pac"! These files are located in one of the game's folders!
And now about the Swamp! I think I'll make a building that will destroy artifacts for any resource! You can also add a building that turns any creature (except necromancers and mechanical creatures) into a troglodyte! And one of the skills of the Swamp heroes will make creatures turn into improved troglodytes! And I haven't come up with the main skill for the Swamp heroes yet! But I have some ideas about reducing the initiative and speed of hostile creatures through swamp slowing! If anyone has other suggestions, please write!:)