Satanvelos

Satanvelos (, Satanberuosu; lit. "Demonic Contamination of the Five Elements") is one of the myriad supplementary abilities and power-ups that's utilized by Devil Slayers and Demon Slayers, considered to be more versatile than the others if anything; this is due to said ability reflecting on the elements themselves rather than the caster, which is quite the rarity. While it's just considered to be a forms of elemental enhancement overall, it's rather potent against the powers of other elemental mages. It's alternatively referred to as the "Exorcist's Curse" (, Ekusoshisuto Kasu; lit. "Evil Blessing of the Demon's Acolytes"), existing solely to be the bane for other forms of elemental spellcasting.

Overview
"Yeah.... I would suggest that you retreat for now and come up with a new strategem. I can't guarantee you'll survive the poison that's contained within the spells I'm casting. Prolonged exposure can lead to some.... Magic Deficiency Disease."

- A Devil/Demon Slayer warning another Mage about the being exposed to his "contaminated" element for prolonged periods.





Trivia

 * While the concept of a "contaminated element" was based on a variety of sources, mainly those outside of anime, it's main contributing factor were the ideas that the author has set apart for his Viral God Slayer Magic — making it more dangerous than it seems. Also, it has to do with the black markings on Gray Fullbuster's body whenever he utilizes his inherited Ice Devil Slayer Magic, which most of the fanbase deem as a side-effect of sorts for its usage.
 * To an extent, the long-term effects inflicted on a mage or obtained from prolonged exposure can be the equivalent of the poison from Samael, one of the most dangerous creatures seen from the light/novel anime series, Highschool DXD. It's said that its posion can kill nearly any living creature, being the extreme bane of draconic beings.


 * The name of this article comes from two words, relating to its overall theme; in fact, they're just parodies of the same word used to describe the — the primary antagonist in Christianity and Islam.
 * Satan (Σατάν) is the Greek form of Hebrew Satan, meaning "adversary." In the New Testament, Hebrew Satan is translated once into Greek Diabolos, and once using the word epiboulos, meaning "plotter." This is also the Late Latin and Old English form of Hebrew Satan.
 * Volos (Волосъ) is the Slavic name derived from the word volu, meaning "ox." In mythology, this is the name of a god of the earth, underworld, dragons, cattle, magic and trickery. He is an enemy of and is described as being horned and serpentine. Also known as Veles.