Kudos to Billy "Wicked" Wilson at Gaminggroove for these tidbits from the official HoMM4 forums. These are from 3DO's Gus S.:
Demonology: "Imps, Cerberi, Ice Demons, Venom Spawn, and Devils are all considered "demonic." To learn demon summoning spells you need Demonology (a secondary skill of Death Magic) and Nature Magic. Ice Demons are Death creatures. No creatures summoned in combat last beyond that combat. To get permanent creatures, you need the Necromancy or Summoning skills, rather than a summoning spell."
Teleportation vs. Flight: "In Heroes 3, no difference at all. In Heroes 4, flyers intefere with flyers, so you can fly over a walker, but not a flyer. Flyers also must pause before flying over castle walls. Teleportation (the Devil ability or the spell) doesn't have either limitation."
Hexagon System: "It's square based, not hexagon based, but the squares are so small that you won't notice them. The smallest footprint is a 3-square diameter circle; the largest is a 7 square diameter circle. For the record, I like hexagons, but they didn't work well with the range of creature sizes we wanted. You can't, for example, have a circle with an even diameter on a hexagonal grid, but you can have an even-diameter circle on a square grid. There are 8 facings in combat, not 6."
Dragons' Fire Breath: "It's a very narrow area effect. It has a range of 9 tiles from the Dragon, but it only affects creatures that are directly behind the enemy the dragon is attacking. It's possible, but difficult, to affect 3 creatures with dragon breath. Normally there's 1-2 tiles between the dragon and the enemy it's attacking, so the breath extends 4-5 tiles behind a creature with a size 3 footprint." |