Pathfinder 1e Monster / NPC: Blast Shadow

Blast shadows usually spawn as the result of a magical catastrophe, but can also be artificially created. Pyromaniac magic users, worshipers of evil fire deities, and the servants of powers that crave burnt offerings favor these undead horrors. A spellcaster of 14th level or higher can create a blast shadow using create undead. In addition to the normal components of the spell, the spellcaster must use the body of a creature that died as a result of a fire spell or effect. The spell must be one that affects an area. Scorching ray is not sufficient, but fireball is. The creature must have died within 24 hours of the casting of create undead. Blast shadows created in this way are loyal to their creator, but those created by a death burst are beholden to no one.