Homunculi are artificial lifeforms created by mages. Elemental homunculi take the form of full-body suits or respirators that consume elemental material and replace it with breatheable air. These can be used to help planewalkers survive even the most inhospitable planes.
Sources:
Monster Manual
Monstrous Compendium
Planescape Monstrous Compendium Appendix III
Eberron Campaign Setting
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