Hmm, I probably agree, that IH could get one additional hero, for now they are really poor in that regard. However this guy should definitely not be anything resembling a power house on the battle field as IH as some extremly good replacements for their missing heroes (global nuking power, cavalry and stronger outpost units, especially the Dragonslayer sounds like some sort of mini-hero).
Therefore I'm not so sure if I like your proposal, LordDainIronfoot, because both diversifying AND adding a new hero to a faction which already has pretty good replacements for their missing heroes might be a bit too much.
Now to your ideas in specific:
--> Yourself (
): I agree with you, that it's not really a coherent summon, because it breaks the time line of the Mod. Now, I don't specifically enjoy the idea of just a blademaster ability: I get your idea of showing he is also a great fighter, but firstly other such leaders / fighters (cough*Aragorn*cough) also are "reduced" to one of their roles and they are looking pretty good right now.
Therefore I would prefer such an idea as CragLord proposed, summoning the Dwarven Slayers (the Lord Dain, Ered Luin could buy in their inn, actually had this ability
). This ability could as well give him a little boost, if this is really needing (what I don't really think, tbh), like: "Dain Ironfoot calls for his best men to follow him into battle. Temporarily summon 2 bataillons of fully upgraded Dwarven Slayers. Dain and these troops get +30% attack for the next 10 seconds."
--> Thorin III. Stonehelm: I like the Mighty Stroke, sort of like Dain's Heir (mainly because attack speed modifiers don't really work on melee weapons, that's some strange issue with the game
), but I don't like Stonehelm the least. Atm the only hero which a hero weakening aura is the Witchking of Mordor and this effect is far more suitable for the Leader of the Ringwraiths than for a dwarven prince. I suggest to not change this ablity at all, having a long lasting fighter is also really valuable against heroes.
--> Murin: This could be an intersting change, but than his damage has to be reduced severely. If he can just give himself +50% (!) armor from level two onwards this will just make him a brutal manfighter for his money. Is the level 8 ability currently the War Cry?
--> Drar: I don't like the amount of soldiers he can summon. Of course they are just a visual interface for his spells, but at least his flame arrows should stay -remember, he is currently the only archer hero in the entire game, who can sort of "upgrade" his basic attacks!
--> Narin: Well, I can understand the reasoning of adding a hero in the first place, but Narin is not ready yet!
First of all, he should only be a very weak hero (as I said: IH has really strong substitutions for their missing heroes!), I am beginning to think if he should even have access to like level 10 or full 4 spells.
Also his current abilities sound disgustingly strong if used in conjunction with other dwarven heroes... Messenger of Dain would just counter a basic weakness of dwarven heroes (them being slow), also it sort of destroys the enemy for ever being surprised by Narin: Imagine you recruiting all heroes than suddenly adding Narin and start a fight with Messenger active. The enemy couldn't escape or at least it would be harder for him to do so and he gets punished even harder for feeding away XP which then gets amplyfied! This ability should just be changed from the beginning, IMO dwarvens don't need that strong hero support because they got Mithril.
Threat of War is a similar story: +50% attack damage and +30% attack speed (which is again not really possibly to do) is ludicrously strong, this spell alone makes this guy pretty broken. I can not imagine any heroes survive this onslaught, this spell is certainly a lot stronger then the final powers of the other dwarven realms. (Which would be double unfair: IH has good replacement for their missing heroes and also a stronger hero?)
Also, I am not content with the Diplomatic Immunity. Grima Wormtongue already has pretty much this ability (Anatar works differently IMO, as it doesn't allow for a quick escape) and I don't think its such an innovative idea to include it again for dwarves.
So, in conclusion: I am kind of divided on your ideas. Some are great, others have potential, others need a lot of work to be ready!
Greetings
Melkor Bauglir
PS: One quick reminder, because you have to keep this in mind: Attack modifiers (like +50% damage) stack multiplicative! This means that multiple modifiers can result in crazy and totally unintended boni (like the +75% attack damage in Dain's possible level 10 ability combined with Narin's +50% attack damage would result in a whopping +225% attack damage, which is obviously trough the roof!
Just wanted to remind you of this. (BTW: This is not the same for armor buffs, they stack additively.)