#they later received full healing which utilized tissue from their beedrill and Shadow ponyta as well

[probablyevilrpgideas]

Many-Are-One: a condition most often seen when someone is saved from death through use of magic that relied on foreign tissue, though occasionally seen when the original injury was not life threatening. A person who was pierced back together using multiple creatures' parts may experience chronic pain as their body doesn't fully accept the foreign tissue, which is more likely and more severe the more alien the tissue is to the person. A human who was grievously injured and their body related with tissue from other humans may experience only an occasional rash. A person who was cobbled together using goblin, kenku, kobold and demon parts may suffer something akin to fibromyalgia as well more obviously magical symptoms.

In cases where a mortal body has an inherently magical being integrated into their body, such as a goblin who's faithful ghost lantern companion took it upon themselves to save the goblin, may exhibit traits associated with the nature of the inherently magical being, such as partial incorporeality or the ability to glow in the aforementioned example. These abilities may cause complications, such as hands that are either permanently or sporadically incorporeal, or an intense, uncomfortable heat at the site of the fusion, which are still significant concerns or disabilities even when the fusion is overall beneficial.

A person who becomes merged with a divine artifact, on the other hand, may experience no such issues, similar "inconveniences," or lifelong pain, discomfort and difficulty, depending on the nature of the artifact, the divinity, and the relationship between divinity and person. A cleric whose missing arm was replaced by a sword blessed by their own god may only experience the typical issues of a person who is missing a hand, if even that, while a person who received healing while the weapon of an antagonistic god was lodged within them may wind up unwillingly tied to that god in a manner similar to a warlock and patron but with no goodwill between the two and experience something akin permanent mental possession.

What are some chronic illnesses that can only occur in a fantasy setting?