Walkthrough of HoMM3: SoD Campaigns

brovach described everything perfectly, so I'll just add a few words about the "Harvest Gathering" mission with Yog, because I completed it in a completely different way, and maybe it will be useful to someone. (This mission is the most difficult, by the way; the others are very easy). Unfortunately, Yog won't get Wisdom and Earth, so you can forget about the portal. brovach focused on strength when completing the mission; I focused on magic. This was greatly helped by the necromancer locked in the dungeon in the south (at the very bottom edge of the map, in the middle) with Earth, Wisdom, and other magical abilities. He also has a small necromantic army with him. Nearby, there is a Seer who will give you Angel Wings for a paltry 15 Royal Cyclops. We free the necromancer, give him wings, and immediately fly to the right, across the ridge - there is a neutral necromantic Castle with a small guard and a decent army inside that can be recruited. We conquer the Castle, recruit troops, and go to destroy the evil. In the necromantic Castle in the northwest, I found a Town Portal (and if I remember correctly - I played it a long time ago - it was there both times I completed the mission). With the portal, defeating the bot is just a matter of technique. In general, my path is: we build a Stronghold up to Cyclops in the first week, gather 15 of them + a small army (money will be needed to hire the necromantic army) - we free the necromancer, give him wings and the portal - and we're good to go :-)