[Wish]

yeah, actually a 4-armer with (in order) dwarven hammer, hammer of forge lord, dwarven hammer would have the bonus from all 3 (i think the 'like items stacking if theres another item inbetween' is a bug though)

if you can find a province with a banefire forge and a steel oven you'd get the bonuses from them as well.

also forge of the ancients does more than just make everything cheaper, it also increases each forgers effective magic levels by 1 for forging purposes. (so if you have an earth of 4, you can forge things that take earth 5 - like the aegis) -- in dom2 this added a level 1 path for every path your mage didn't have... but in dom3 it only effects paths they have.