Nagash should get diplo debuffs as he goes up the pyramid

I understand why they didn't give him the +40 aversion penalty most of the evil factions get, because it would become a massive pile-on.

But it's weird that nobody ever really reacts to the lord of the end times teching up to destroy the world. Hello neighbour I am Nagash, here to destroy the world, would you like to buy some sugar and assorted spices from distant Araby?

The 3 "gateway" techs on the pyramid should provide a diplomacy debuff (and maybe some other bonuses). E.g. yeah you can tech up to the next tier, but it comes at the cost of a factionwide -20 (maybe exclude vampires or give a +20 to undead factions at the same time).

Just a thought