Oxygen-Expelling Mask Technology / Science in Etharai | World Anvil

Oxygen-Expelling Mask

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The oxygen-expelling mask, or OEM, is a device used to allow angels to travel to lower altitudes and away from their homes in the dewdrop peaks. The mask filters the air that the angel is breathing, reducing their oxygen intake and allowing them to travel in higher-oxygen areas without risk of contracting oxygen sickness.

How it Works

The OEM is an airtight mask that fits around the mouth and nose of an angel. There are two types of OEMs. The first type is a self-contained OEM, which as a specific supply of air that is connected to the mask, allowing the person using it to breathe air of a certain oxygen content. The advantage of this mask is that it can be generalised to use for any species going anywhere with a different air environment than one's own. However, the downside is that it only supports so much use before needing to be refilled.
The second type acutally filters the air, using materials that attract oxygen molecules but allow the rest of the air to pass. The little oxygen that is able to make it through is enough for the angel to breathe safely. The upside to this type of mask is that it lasts for far longer, however it comes with a disadvantage of having a reduced efficacy in even higher oxygen-rich environments, making it not 100% effective.
Access & Availability
There is a minor issue with the availability of this technology, in that it is mainly manufactured on the surface, rather than by the angels. This is because the materials used to make these masks cannot be found in the Heavens, and is exclusive to the surface of the planet. Because of this, it is difficult for angels to obtain OEMs, as they must first be brought up to the peaks.
Related Species


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Dec 5, 2023 23:10 by Dr Emily Vair-Turnbull

I really love the little detail that the masks are manufactured on the surface.

Emy x   Etrea | Vazdimet
Dec 5, 2023 23:24 by spleen

thanks! i wanted a way to explain why not many angels travelled down to the surface

Have a wonderful day!
Jan 2, 2024 20:08

I've always liked the concept that a species that cannot exist in a specific type of environment is allowed to do so through the usage of some technology or magic, because it opens up new possibilities for writing scenarios involving a character that is outside of their natural habitat. The "fish out of water" effect, if you will. Makes for a great story hook, in my opinion.   Some savvy businessman could sniff out an opportunity to begin exporting the materials and processes for making the masks to the heavens. Bet there would be good money in that. Or do angels engage in monetary bartering? I'll have to read up on them!

The Eternal Hymn sounds into perpetuity on Nascindor
Jan 2, 2024 20:40 by spleen

the entirety of etharai uses a barter system rather than money, actually! i do love the "fish out of water" trope. thanks for your comment!

Have a wonderful day!