Kahd just made his first proper grab for power. I decided that for the first test game he'd be rushing for Strength of Will and choosing to serve Mammon - it definitely worked
Started off sandwiched between Daracaat and Hannah, though Daracaat had declared war on Hannah before Turn 100 and I jumped in to grab an outlying city of hers near my border. Daracaat got stalemated by Hannah's capital (Combat5 Archers on a hill, with walls) and that war bumbled on for another 100 turns or so.
Meanwhile I built up the "summoning" infrastructure - Libraries, Meditation Halls, Mage Guilds, The Great Library... and researched as quickly as I could toward Strength of Will. Around turn 250, Daracaat decided he was going to attack me instead of Hannah (my cities were only really defended by Gnoslings, Thades and Warriors). Unluckily for him I'd recently completed the Strength of Will research and switched to Mammon worship. I had enough infrastructure to support 2 Psions (which arrived within about 12 turns of each other), and had another 2 Arch-mage candidates that also took Mind3. The SoD (Stack of Domination) intercepted Daracaats attack force and stole all the Brutes. The Brutes then fought off his Huntsmen, and the stack marched on toward his border cities.
Dominating the defenders is excellent fun, though after taking one city, both my Psions lost their ability to cast Domination (resisted) on the second. I chose to disband them and hoped for a quick return of fresh ones, but luck wasn't with me there and it took about 25 turns to get one back. By the time I'd finished the Archos off, the second still hadn't returned. The remaining ArchMagi and their attendant Brute horde were sufficient to roll over the rest of Daracaat's cities - one of the ArchMagi retired to rule his capital after losing Domination. The attack was much slower for the period where I only had one Domination caster left, but the dozen or so dominated units were (just) enough to blitz the cities that were left.
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Short version - aggressively dominating with Mammon-Kahdi is a viable and fun tactic, especially against a warmonger like Daracaat
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Later on I tried a similar tactic against Hannah, but the Psions were killed very early on (they don't hide like Arcane units, so they quite often find their way to the top of the defender's list - design choice) and then the rest of the stack was defeated by her own stack of doom. Kahd himself was a little disappointing, as he failed his very first domination attempt and had to wait a while to get the ability back. That was more poor luck than an issue with his design however. In most circumstances an Arch-mage Hero with Mind1-3 from the start is going to be a very useful thing to own.
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I've also come to the conclusion that the Kahdi don't really need Champions at all, so they're being cut - which makes them rely upon their gate creatures in the early game, and the path-specific strengths in the later game. For Oghma followers, that basically means using the Gate Creatues and making sure their affinity is sufficient to keep them as strong as the opponent's troops. Their version of Kahd starts with Metamagic3 and a random selection of spheres/levels from the other "good" spheres.
The path specific strengths are;
- Oghma-Kahdi have a 50% bonus to the maximum number of creatures supported and generate them three times as quickly as Mammon-Kahdi
- For Mammon-Kahdi, the main part of your "physical armies" is likely to be dominated troops from your enemies - only Mammon-Kahdi ever get Psions and their version of Kahd also starts with Mind3