Rilmani exist to protect the middle ground and correct any imbalances that would compromise it. Ferrumachs are the brute force of the rilmani. They serve as foot soldiers and cavalry in the unending battle of protecting the Balance.
They resemble strong warriors with skin like iron.
Sources:
Planescape Monstrous Compendium Appendix II
Fiend Folio (D&D 3.4)
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