The Castellan Victor
Promotions
General Information
Redoubt
Very strong to help you defend against an impromptu war especially when combined with Defensive Tactics’ Bastions giving a city +11 Combat Strength which is extremely unsavory to attack without an extreme advantage
Garrison Commander
Extremely powerful for both defense and to hold captured cities +5 combat for all units in your city's territory--this applies offensively if the enemy you're attacking is also within this city's borders
Defense Logistics
Extremely powerful to prevent another player from taking a weakly positioned city easily. Combined with the rest of the Castellan's kit this can single handedly thwart an offensive
Security Expert
This is actually going to be a very important mid game upgrade due to the rise of Spies since Spies will now be able to flip cities using a new Mission so getting this upgrade by the time spies are coming online will be very important to keep your cities yours
Embrasure
While 2 shots looks nice since your city strength ranged power is tied with your strongest ranged unit’s this won’t mean much until you hit Machinery and upgrade an archer into a x-bow
Air Defense Initiative
This doesn’t mean much for you unless you’re facing a barrage of bombers/fighters but that’s unlikely considering that most players will not invest into that type of unit. However now that nukes are stopped by all anti-air units this is particularly useful once they start dropping.
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Credits:
Photos taken from Civilization VI and edited by Justifier