Unholy flames

Umbrella term for the spells that use flames produced by death themself, if used with a magic level below a 25 will almost certainly kill the user and even with a 25 and above will still gravely injure the user.
 Because of these two criteria the spells are very rarely used, the only reason they ever been used at all is because of how effective they are. They can span over 22 kilometers of land and instantly killl anything they touch. 
Note:As of 16509 and the Lefroa genocide using the spell is considered a warcrime and is punishable by constant, ramping torture for the rest of the offenders mortal existence