Here’s extra suggestions (but more of a combined compilation of all the suggestions I made so far):
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Allow the ability to garrison relics in any building, accelerating their production/research.
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Remove monastery altogether for HRE and just replace it with Regnitz Cathedral, making it a civ only building in the same vein as Delhi’s Mosque, but you can only build one. Still allow the garrisoning of relics, but they no longer generate more gold than originally but keep the “Sale of Indulgences” mechanic, with a slight difference that the Prelates are stationed outside the Cathedral, the same way that Imperial Officials are, and make it an upgrade.
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Give prelates the ability to mass bless your units if they’re currently holding a relic, which will fix the problem of Inspired Warriors being useless if you cannot bless multiple units at the same time.
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With a landmark spot vacant, they can introduce the Marienburg (aka Malbork) Castle landmark, giving people access to the Teutonic Order, because you cannot have a HOLY Roman Empire, without HOLY ORDERS.
We’ve already gone through the idea of Ritterbruder, which are cavalry units that turn into heavy infantry upon death (having Knight and Man-at-Arm stats) and give an attack speed aura to other infantry units.
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With that, we’re back to Burgrave Palace, and if both buffing the Landsknechts and reducing unit cost from the landmark is too much, we go back to the original idea, where Burgrave has bonus upgrades for the Landsknechts to make them more a part of the standard army, as well as having the ability to shoot at the range for a short period of time.
So you have to choose between having stronger Landsknechts or having a stronger unit buffing all other infantry units.
As for Elzbach Palace, since it’s nowhere near as good as Berkshire Palace of English, or Red Palace of the French, (considering that these are known for devastating your opponents’ armies, and the damage reduction is nowhere near as useful), the other alternative I can suggest is passive unit generation as to avoid the repeat of English’s Wynguard Palace.
The final unit would be dependent upon which landmark you didn’t take for Age 3.
I am confused though about Achen Chapel. Is the suggestion that the TC would be built around it to reduce the cost of units produced in it, or to reduce the cost of TC being built?