Judging by what you described, this would make the template imbalanced.

How can a template be imbalanced—it's just a layout, after all?

First of all, Necropolis is already significantly strong on Jebus Cross given its faction specialty, especially since Pandora's Boxes with Ghost Vampires are not uncommon.

Significantly strong compared to what? Necropolis is strong on any template, but especially where there's good skeleton growth dynamics, i.e., a large number of low-level guards. For Jebus Cross, there won't be many such guards. And here, as always, Conserves and Dragon Fly Hives are the deciding factors. And Galthran. Now he's imbalanced. He can be picked even for a different town (last year's final is a clear confirmation). For Necropolis, even the level 7 unit is the least promising of all towns. Remove Galthran, and the town would go from being an outsider to a complete outsider. Like Conflux with Inferno and Tower. Again, let's look at the statistics from the last tournament. And boxes with Ghost Vampires are something semi-fantastical. I personally have never encountered them on Jebus Cross, but I have on large templates.

Second, the strength of Fortress and Necropolis will increase significantly thanks to secondary skills, and if we also factor in the treasure zone of Necropolis-Fortress, it's simply a slaughter.

Thanks to what will it increase? Surely not because of the double? Well, that's just saying something for the sake of saying it :D Any other town would be stronger thanks to the double. As for the treasure zone coinciding with the town type... out of the 7 games that were used in the last tournament, what's the probability that they'll coincide? And what difference does it make anyway. And what kind of super troops will Necropolis get? Will 3 Wraiths really be better than 3 Titans, Behemoths, Archangels... And once again, let's look at the statistics.

Clearly, such a template is not needed, at least in this tournament. Requests to discuss a new template should be made in another thread.

Then there was no need to fill the post with pointless reasoning; you should have just moved it to the discussion board.