Heroes 5.5 WarGame Edition - Tactical Edition.

So, was the cost of guilds reduced?

The cost of a level 5 guild is approximately equal to the cost of a tier 7 dwelling, but it's cheaper in gold (and more expensive in resources). I wouldn't say it's become more accessible than in the original; it's still a top-tier technology.

I don't think so; in general, the guild is easy to build if you're not building creatures. However, in the first two weeks, there's no point in building a guild because even if the hero is actively fighting, they won't have time to level up to Expert in any magic.

Actively fighting means at least 1 level-up per day; what's the problem with maxing out a school in 1-2 weeks?