The current forging system right now only relevant on the first 10 floors or so.
After that I think forging is totally pointless. It’s infinitely faster and much more cost effective to disenchant a high level artifact you get elsewhere rather than having to kills hundreds monsters to level them up.
Maybe add another option to forge artifacts with random enchantments on them. (cost 5k granite?)
Alternatively make the artifact drop rate much lower and always drop at level 1 only. (Please don’t!)
Or allow random enchantments on them when forging artifacts touched by gods.