Ironman is a hardcore-only mod based heavily on the Ironman style of game play, and as such imposes many rules and limits on what can or cannot be done in-game. The mod however does not fully comply with Ironman gameplay, as NPC interaction is allowed, hirelings can be hired... and so forth.
Hardcore-only means that every character created by default is in Diablo II hardcore mode. The ability to create softcore characters is gone. Hardcore is the only real way to play Ironman as it tests your abilities to the limits.
Here's some info about the mod. I don't want to give everything away. Play the mod to discover its awesomeness.
#Experimental Items (Only in beta version, not in public version. For testing crafting ideas.)
Take all the junk magic, rare, set, or unique items in the game and store their magic essense in the Harvester. This will destroy the item in question. You can then use Essence Points (EPs) to create all kinds of magic items and properties.
Use the Magic Harvested from items to create new items
Store all your gems in one 1x2 gembag. In Ironman, inventory space is everything.
Store all your gems in one 1x2 runebag. In Ironman, inventory space is everything.
Rare & Magic Arrows