https://www.youtube.com/watch?v=7swJniA1Ut8

Reforms Basic Information:
- Most reforms are based on two factors: Imperium level and turn number.
- The Upgrade technology for some factions simply allows units to be upgraded once reforms are hit, they do not unlock units themselves.
- When a Reform for a faction occurs, new units will be available to recruit and the older versions will no longer be recruitable.
- The AI has different requirements for Reforms, they only require a certain turn number.
- Technologies that unlock barracks types are still present, as each barracks level has a value in each reform tier.
- Some factions rely on the Greek global reforms. These include Armenia, Illyria and Odryssia.

Roman Auxiliaries
- Unlike other reforms, Rome's auxiliary barracks is locked instead of the units.
- Once Marian reforms are reached, the tier 3 auxiliary barracks is unlocked. At Imperial, tier 4 is unlocked.
- This was done to help with load times.

Unit Upgrades
- Units from previous reform tiers can be upgraded to the new reform tier in some cases.
- Make sure to research the custom technology for your faction in order to get the unit upgrades. Germanic and Gallic cultures do not have a custom technology.

Player Cultural Reform Triggers:

Rome
Polybian - Imperium level 3, minimum turns 40
Marian - Imperium level 5, minimum turns 100
Imperial - Imperium level 7, minimum turns 210

Greek\Successor Kingdoms
Thureos - Imperium level 3, minimum turns 50
Thorax - Imperium level 5, minimum turns 120

Celtic\Gallic\Iberian\German
Neitos - Imperium level 4, minimum turns 90

Parthian
Late Reforms - Imperium level 5, turns 120


Global Cultural Reform Triggers:

Rome
Polybian - Turn 50
Marian - Turn 130
Imperial - Turn 240


Greek\Successor Kingdoms
*Carthage, Armenian, Odyrssian and Illyrian reforms will trigger on these turns as well even for the player.
Thureos - Turn 60
Thorax - Turn 140

Barbarian (German, Celtic, Gallic, Celtiberian)
German - Turn 115
Iberian - Turn 117
Celtic/Dacian - Turn 110

Parthian
Late Reforms - Turn 130

Saka Rauka Special Reforms
- Unlike other factions, Saka Rauka has special reform requirements.
- Once the faction owns the regions bordering India (Transoxiana and Baktria), the reforms will trigger.

Royal Scythia Reforms
- Scythia also has special reform requirements.
- The reforms can be triggered 2 ways. Either 100 turns of owning a region of another Scythian/Sarmation faction. Or, 70 turns and 10 battles against other Scythian/Sarmation factions.

Dacian Reforms
- The Getae have special reforms. They require 100 turns and 10 battles with Rome for the player or 130 turns for the AI.