Been playing around a bit with the mod today. Very fun. I always liked skaven, even though it was my brother that had himself a skaven army.
Some initial thoughts:
Great variety of troops. I had a hard time deciding what to build. I want them all. They come with great flexibility. I'm not sure, but it is possible that you should make specialists a bit more expensive, so they are recruited mostly for special tasks and counters.
Consider if you want summonables to be freespawned as well. I found that I didn't really care for research, as I could get warpfirethrowers etc just by recruiting commanders. I quickly lost interest in research. There was probably some higher lvl summons that I can't get if I just summon allies.
Summon allies is generally a very powerful ability that is difficult to valuate, but my initial impression is that the summoned allies were quite cheap. A warpfire thrower might be about as good as a fire drake, perhaps better, considering the larger area attack (but lower survival rate) wich costs 10 gems = 10-150 gold. Or as good as 9 arbalests (3xall hit in an area) that fires every turn and always hits, but has short range and more friendly fire. I would probably pay at least 50 for one of these guys, even with friendly fire. Thus I would gladly pay for the warlock at 250. Only I would then not be able to buy rat-whippers that get lots of cheap giant rats
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Building as many castles as you possibly can is probably crucial to pump out as many freespawners as possible.
So I had a blast, but whipped the [censored] out of Ulm who happened to be near me
Another thing you might wanna reconsider. Plague priests' plague scepter. That is an artifact lvl item they got (secondary effect of woundflame, same as the spell plague lvl 7 IIRC). With one successful strike against an enemy (prefferably large or well armored so he survives the whole turn) you can destroy an entire army of say 1000 units (including your own of course). I suggest you replace the plague secondary effect with leprosy or some other nonvirulent disease
Hmm. I wonder how the AI handles them. Probably very well, considering they have freespawners and great initial troops. The AI is fond of freespawns and summon allies IIRC. More so than moving around in a strategically sound way