[fungalreason]

It's probably the mason hero (if you can wish for those). From Edi's database here are the paths you would get for the ones with a 25% forge bonus:

Forge Lord FE
Ice Crafter W
Iron Crafter E
Mason of the Underworld FE2WD3H
Master Smith FE2 +10%(FAES)
Priest Smith FE2H
Warrior Smith E +100%(FAWE) +50%(FAWE)

This one also seems good, but it's only a 10% forge bonus. I've never heard of that unit, so I guess it's another hero?

Long Handed F3A3N2H3