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Regarding the dwarves – TO THE NORTH! Magic and Technology are too different!
Yes, they are different. And both require high knowledge, at that. But, besides the ability to shoot lightning, wouldn't strong armor, metals for golems (which, by the way, represent technology; mages only animate them), high-quality siege weapons, and strong walls be useful? Well, I'm just saying, I probably wouldn't include dwarves.
Regarding the Witchers – A GOOD IDEA! But a neutral Witcher would be better... Level 6, attack bonus against ALL non-humans, an ability similar to a Rakshasa's, but with a bonus to speed.
Against all non-humans – yes, perhaps. However, Haven has an advantage – it has many, almost all, humans.
The higher the level of the creature, the higher the bonus to damage... You could make it a feature.
As for the ability, you could make it health regeneration (only health).
Level 5 is most suitable for Witchers – not in large numbers, but strong enough.
Appearance – of course, not like in Sapkowski's books – but you could make them have white hair and a dark cloak with a two-handed sword. Neutrals, like snipers.
History:
Some people are born with the Witcher's Sign – this gives them unprecedented qualities: agility, strength, intelligence – but makes them outcasts. Newborn boys with this sign are never left in their birth home: most often, they are given to be trained by the Forest Brotherhood [Forest Guardians] – an alliance of people who could not find a place for themselves in the lands of humans and mages, and decided to live independently.
[That is, this brotherhood is a small, hidden forest state where almost everyone is male and skilled with weapons – swords and bows. Snipers (from Heroes3), Witchers, some elves, and monks who decided to move to this place live there. You could, by the way, create a nation:
- they worship the Dragon of Air.
- and they appeared at the time when humans changed their patron dragon to Elrath – part of the monks went to the mountains and created a settlement there. Over the years, it grew and developed rapidly. But, one day, it was almost completely destroyed by an attack by human troops on the orders of the then-leadership against "heretics." Since then, the people of this kingdom do not trust humans. And, fearing repeated raids, the settlements of the Forest Brotherhood are carefully camouflaged, and a large part of the population is proficient in the use of weapons. No one who has not become a member of the Brotherhood knows exactly where the settlements of the Forest Guardians are located. Over the years, they have almost been forgotten, but they exist – a small, but powerful state.]
Young Witchers are raised in rather harsh conditions, under iron laws and strict rules. If they pass all the tests, including the final one, they become full members of the Brotherhood and take the Oath of the Forest Guardians...

