I wanted to go into this a little more detail on this topic so I decided to break if off of akatosh's spiritual trait thread.
If you have summoned the Mercurians and want to build up Basium's strength, you want to give him lots of angels that start with high experience. This means generating lots of high-experience figures with either Runes, Empyrean, or Order religion, which can be used in battle.
I see a few basic options:
Civ-Specific strategies:
These strategies don't really apply to civs in a permanent alliance with the Infernals. The living unit promotion paths available to the guaranteed-evil-religion units aren't conducive to unit spamming. I suppose you could pump nightwatches if you really wanted to, but it's not all that efficient. The only option you really have is to try to get all three evil religions in every city. A living unit built in a city with all three evil religions has a 38.6% chance of following one of the three.
However, you don't really care about XP when you're trying to create manes, so you can spam cannonfodder if you want. A CoE/AV/OO Clan city could spam warriors from warrens, and send the religious ones off to their deaths to make manes while the no-religion ones were promoted and kept. Hyborem himself can just spam any living unit; the Slave->Lunatic path suggested above for Basium applies here, although without Ingenuity it's not as appealing.
If you have summoned the Mercurians and want to build up Basium's strength, you want to give him lots of angels that start with high experience. This means generating lots of high-experience figures with either Runes, Empyrean, or Order religion, which can be used in battle.
I see a few basic options:
- Radiant Guards -> Champions: This is the only way to generate a steady stream of metal-using troops that have a good religion. If you don't have any wonders that let you easily create high XP units, this is probably the most efficient way to give Basium a ton of angels by producing them in lots of cities. Choosing civics to add starting XP is nice here. (Theocracy+Apprenticeship+Conquest+Form of the Titan+Command Posts can get you 10 XP starts for figures.)
- Altar/Deis Dei city + Crusader/Paramanders: Lots of free XP trumps Iron Weapons, given that the Angels get to use the XP, too. Of course, only one city can get these bonuses, but if it's a strong production city (and it might be with all those high-hammer priests) and you just pump troops nonstop in that city, it can be a significant portion of your army.
If you have cash to burn and are far along the tech tree, you can go nuts with Priors promoted to Paladins. This gives you spirit guide on a powerful fighting unit, allowing you to plow that experience back into other units when the Paladin goes down.
- Rathas + Ride of the Nine Kings: Similar to Crusaders/Paramanders coming out of the Altar city. Promote to knights if you have money to burn.
Civ-Specific strategies:
- Mercurians: If you switch to play the Mercurians, then religion no longer matters. It's all about efficiently producing high-XP units. Basically, you can pursue the Radiant Guard->Champion approach while just producing Champions (or Horse Archers, or whatever) directly.
Alternatively, if Basium is neutral, and you have slave trade and an Asylum, you can buy slaves, upgrade them (cheaply) to Lunatics, load them on a ship, and dump them in enemy territory during a war. You won't have a lot of XP with angels generated this way, but it gives you lots of raw numbers with no hammers expended. (Credit to akatosh for this idea.)
- Calabim: Your Radiant Guard -> Vampires can feast their way to high XP. This pushes you strongly towards Empyrean if you summon Basium with the Calabim.
- Sidar: This whole strategy fits really well with the general strategy of maximizing XP that the Sidar pursue. Every unit either becomes an Angel or a Shade. It's win-win.
- Elohim: Reliquary allows you to get Spirit Guard on everything, not just Prior-Paladins, thus accelerating the process.
These strategies don't really apply to civs in a permanent alliance with the Infernals. The living unit promotion paths available to the guaranteed-evil-religion units aren't conducive to unit spamming. I suppose you could pump nightwatches if you really wanted to, but it's not all that efficient. The only option you really have is to try to get all three evil religions in every city. A living unit built in a city with all three evil religions has a 38.6% chance of following one of the three.
However, you don't really care about XP when you're trying to create manes, so you can spam cannonfodder if you want. A CoE/AV/OO Clan city could spam warriors from warrens, and send the religious ones off to their deaths to make manes while the no-religion ones were promoted and kept. Hyborem himself can just spam any living unit; the Slave->Lunatic path suggested above for Basium applies here, although without Ingenuity it's not as appealing.