Expert's Corner (by ThE_HyDrA)

Much like its evil-minded partner in crime, the Inferno also has a healthy number of special buildings to aid its cause, though they are not all as effective as they could be. The Infernal Loom, however, is an excellent structure to aid in Gating, speeding it up by a huge 30%! Together with even Expert Gating (Critical Gating and other abilities), the Inferno class ability has become much stronger due to this improvement. It is a small investment, but one well worth the measly 1000 gold 2 mercury and 2 sulfur. In a stark contrast, the Spawn of Chaos structure is perhaps one of the most useless in the game. Why would anyone want to boost the growth of Horned Demons? (There is a reason) But the boost is so small, why bother with it? The bonus simply isn't big enough - it may be viable for 5 or 6, but 2 just doesn't warrant it.

Despite the cheap cost for the Halls of Horror, the town level pre-requisite is quite high. If you're still in the middle of town development, then the building can wait (e.g. the Desecrated Temple has higher claims to this) but it provides an average level 5 bonus, and Nightmares are excellent melee fighters. Sulfur is the only element that may prevent you from acquiring them due to it being needed later on.

Yes, there's a use for those Horned Demons - it is called the sacrificial pit. If you never have any intention of using these creatures, then this is where they go (or, alternatively, don't buy them at all), but trading them in for experience is not bad if the map is short on gold chests and learning stones, etc. This is not the recommended way to level-up a hero, but can be useful when developing a low-level hero.