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Dragonlance Campaign Setting
When a male sivak dies, it changes shape, assuming the form of the humanoid being that killed it. This death shape
lasts for three days, and then the entire body decomposes into black soot. If the sivak's slayer is larger than the sivak or not humanoid, the sivak instead bursts into flame, dealing 2d4 points of fire damage to all creatures within a 10-foot radius (DC 17 Reflex save negates).
When a female sivak dies, it bursts into flames, dealing 2d4 points of fire damage to all creatures within a 10-foot radius (DC 17 Reflex save negates).