The lizardmen are unlike most species in that they do not reproduce, not even in the fungoid manner of the Orks. Instead they are birthed from sacred spawning pools housed in the innermost catacombs of their cities. These pools periodically disgorge whole groups of lizardmen. On Mallus this process was subject to the mysterious timetable of the Old Ones; now it is governed by other principles, and the spawning of lizardmen is more regular. The base spawn rate for a level 1 city is as follows:
5,000 Saurus per turn
10,000 Skinks per turn
1,000 Kroxigor per turn
Slaan are no longer spawned
These numbers increase per increased city level - a level 2 city will spawn 10,000 Saurus per turn, a level three 15,000, and so on. This happens regardless of the level of the geomantic web, to represent additional spawning pools being created.
As the geomantic web increases in strength, so do the frequency of spawnings - a level 2 Web will cause all cities to spawn twice per year, effectively doubling the base spawn rate from 5k/10k/1k to 10k/20k/2k. This increases to three times per year at level 3, four times per year at level 4, and so on. Research into the nature of the spawning pools may unlock further enhancements.
Each level of city has a soft population cap that once hit will cause the pop growth in those cities to go to other cities that are empty, or until that city falls under the cap again. This is primarily for my aesthetic enjoyment of nice even numbers, but also has a fair amount of thematic connection to the lizardmen. The caps go like this:
Level 1 City: 50k Saurus, 100k Skinks, 10k Kroxigor
Level 2 City: 500k Saurus, 1m Skinks, 100k Kroxigor
Level 3 City: 2.5m Saurus, 5m Skinks, 500k Kroxigor
Level 4 City: 6.25m Saurus, 12.5m Skinks, 1.25m Kroxigor
Level 5 City: 12.5m Saurus, 25m Skinks, 2.5m Kroxigor
Slann may be dedicated to spawn lizardmen during a turn. The base amount of each type the differing generations of slann can spawn per turn are as follows:
5th Generation: 1,000 saurus, 2,000 skinks, and 200 kroxigor per slann
4th Generation: 5,000 saurus,10,000 skinks, and 1,000 kroxigor per slann
3rd Generation: 25,000 saurus, 50,000 skinks, and 5,000 kroxigor per slann
2nd Generation: 125,000 saurus, 250,000 skinks, and 25,000 kroxigor per slann
1st Generation: 625,000 saurus, 1,250,000 skinks, and 125,000 kroxigor per slann
However, this rate is affected by the Geomantic Web's multipliers to regular spawning - Magnitude 3 would multiply these figures by 3, for instance.
It is also possible to focus on a specific breed of lizardmen - consult
this post for more information.
In addition, each slann passively spawns 1/100th of its capacity in lizardmen per turn - a 5th generation would thus spawn 10 saurus, 20 skinks, and 2 kroxigor per turn at Web Magnitude 1, 20/40/4 at Magnitude 2, and so on.