Almost all selectable promotions in civ5 (meaning, the ones you select when a unit gains a level) have other promotions as requirements. The Civilopedia already lists the requirement for each promotion, but only its immediate ones; is there any chart or diagram summarizing this promotion prerequisite hierarchy?
Civilization – diagram showing the requirements for each promotion
civilization-5
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Well, apparently Enter works for "Unit Needs Orders" and "Next Turn", but haven't found one for "Choose Research" or "Choose Production".
Here, I just made one for you, based on information available from the actual game files.
Click the image to see a larger version!
Notes:
- This is updated up to the June 2011 patch and DLCs; however, unique units always upgrade in exactly the same way as the units they replace, so if some unique unit is missing from the chart above you can just find out what it replaces to see how it upgrades.
- Gun units and melee units are not the same - in particular, they differ in some promotions, you can check my promotion chart which uses the same icons.
- The Giant Death Robot is indeed considered an armor unit.
- Missiles, bombs and SS parts are non-upgradable (and removed from the chart for brevity).
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Best Answer
Well I managed to produce one myself, though it took a few tries until I got the layout right. Click the image to see it full-sized. Explanation and notes below.
On the left are the unit types. An archer signifies all regular ranged units, a cannon all siege units, etc.
The promotions appear in black rectangles. A promotion with more than one rank lists all the ranks with their effects. Acquiring a higher rank requires the rank before it first.
The leftmost promotions are the basic promotions - those do not require anything except for themselves. The rest of the promotions are either blue - unlocked from rank 1 of any of the base promotions; yellow - unlocked from rank 2; or red - unlocked from rank 3. For example, unlocking the Sortie promotion requires either Dogfighting rank 2 or Interception rank 2.
Some of the "melee promotions" are limited to a subset of melee unit types - in those case a small icon signifying the allowed unit types appears above the promotion. For example, Charge is only available for mounted units (horseman / knight / lancer etc.) and tank units (Panzer, Tank, Modern armor, Giant Death Robot). If no icon appears, it means the promotion is available to any unit types appearing on the left. The Rifleman icon is for units without a ranged attack but that use gunpowder technology, such as a Rifleman or an Anti-Tank Gun.
All images and text copyright of Firaxis. Also, yes, the diagram is missing the woodsman image :(