Editing Ianthina (section)

== Lumens ==
"Lumens" collectively refers to all the parts of an ianthina that glow: the antennae on their foreheads, the spots on their skin, and the edges of their fins. Lumen color is unique to each ianthina, influenced by a complicated array of genetics. It also colors their blood a deeper, richer shade of their lumen color. These spots can be found all over the body, but they tend to cluster on the face, shoulders, thighs, and fin edges. The different types arise from mutations in their spots. Freckle-types are standard. Spotted-types have extra large lumens, thus glowing brighter--a boon for others, but occasionally too brightly for the ianthina who has them. Ring-types are closely related to spotted-types: it's as if the spots never got filled in, for a more normal level of brightness. The thin edges of star-type lumens means they glow a little dimmer, but not significantly. Constellation-types have thin, misshapen spots that give the appearance of the constellations. Constellation-types also tend to have fewer lumens overall, making them slightly dimmer. The typically-thin lines on stripe-types means they tend to have a dim glow as well. The brighter an ianthina glows, the warmer their bodies are.

=== Toxicity ===
The chemicals that provide lumen coloration and make them luminescent also happen to make ianthina mildly toxic. This toxin doesn't spread through skin-to-skin contact, but it is found in their flesh and bodily fluids, to varying degrees. Generally speaking, this doesn't impact an ianthina's daily life. It's only a problem if you're a shark trying to have an ianthina for lunch; fellow ianthina are immune to the toxin. That said, the genetics that cause lionfish fins happen to be linked to an ianthina's toxicity, and lionfish-type ianthina are far more poisonous than average. The toxin in their saliva means that, if they bite you and break skin, contaminating the blood stream, you will become ill on top of whatever damage they do. Fortunately for landdwellers with lionfish ianthina lovers, the effect is far less potent if exposed to their saliva through, say, a kiss. At worst, an extended makeout session may result in some numbness and a tummyache.