The Tatara is meant to address multiple limitations in how Japan is played, since their kit is very streamlined into specific choices. The Tatara does so by supporting the change in the UA, which gets to trigger GWAM progress from Great Engineer birth, and which is the flashier part of the proposal.
Flavor-wise, the Great Engineer birth is meant to capture how smiths from Japan became legends and inspired myths, like Masamune, Sanjo Munechika (credited with inventing the katana, and protagonist of a Shinto myth and Noh play) and Muramasa. For an example of such myths, see
this video from 10:19 to 15:40.
Mechanically, it allows Japan to trigger the UA during peacetime (addressing a very old complaint) and to not be pigeonholed into Authority for its Great General faith purchase, since Tradition can now support the UA with Great Engineer Faith purchase. This breaks one of the streamlining parts and gives you two options in how you want to approach Japan in each of your games.
The other mechanical change is regard replacing the +1
on Defensive buildings in the UA, originally intended to help Japan's early game, with a proper Ancient UB. The current UA places those yields on an expensive and non-economic building, while also pigeonholing Japan into Goddess of Protection; going for another pantheon practically means wasting the current UA's early yields. The Tatara allows you to get proper yields from an actual economic building, and, instead of limiting you to one pantheon choice, it has synergies with five distinct ones for you to choose:
- God of Fire: +2 Faith to Forges, and a clear choice for when you spawn with a mine-related monopoly in sight.
- Goddess of Wisdom: yields in cities with a specialist, of which the Tatara provides a slot of, and buffs.
- Goddess of the Home: her bonus Food helps feeding the Tatara's extra specialist, and the extra Production from the second Engineer (and Tatara's bonus to them) lets you proc the pantheon's yields on building completion more often. Furthermore, the addition of the Hokora as a cheap building is basically a free proc for the pantheon.
- Goddess of Beauty: benefits from the Tatara's extra Engineer and Production to compete for Wonders, making it a much more reliable pantheon. Furthermore, Great Engineers triggering GWAM progress means the pantheon's Faith from Great Works can come in play earlier than usual.
- Tutelary Gods: a pantheon that normally struggles with founding, it benefits from the Tatara's extra Engineer slot to produce up to 3 Faith per city in Ancient Era. And both the pantheon and the UB stack bonus yields on the same specialist.
It also addresses an old complaint that Japan's UA GWAM procs are most often gated to Medieval Era, since Japan's militaristic bonuses are only unlocked at Steel. Moving the virtues to the UA, and adding Great Engineer as another trigger, means that Japan properly enjoys an UA throughout the whole game, as people often want UAs to be. Which reminds me:
This would make sense in the 2UC context, but not in the 4UC. The issue is that Japan's current kit is heavily biased to Authority, a tree which rewards early aggression, despite the civ lacking both an early UU and militaristic bonuses to accomplish that. Which tends to run into issues if your closest neighbor(s) happen to have an Ancient or Classical UU, like Egypt and Greece. And the 4UC integration is going to add more Ancient/Classical UUs, further restricting how reasonable it is to play Authority with Japan. As examples:
- Assyria: new Ancient UU, unique class.
- Babylon: new Ancient Spearman UU, on top of the already existing Ancient Bowman.
- Carthage: either a new Ancient Horseman UU, or a new Classical Skirmisher UU.
- Celts: new Classical Skirmisher UU.
- Huns: new Ancient Horseman UU.
- India: new Ancient Archer UU.
Moving the virtues to the UA helps ensuring Authority remains a viable path in such context, and that it isn't simply eclipsed by Tradition with the addition of the Tatara + Great Engineer in the UA.