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Baron Muster with late-stage Maske Tumor

Maske Tumor (人面腫?), or Masketoma (マスケトーマ?), is an aggressive form of teratoma caused by exposure to a corpuscular substance called Metus Iris (恐怖の虹?).

The tumor takes the form of fully-developed heads which grow in profusion both outside and inside the host. The heads have fully formed brains, and appear to be fully capable of independent thought. Death from Maske Tumor often comes from the high nutrient and oxygen demand from the tumor's brains, which stresses the victim's heart and lungs to the breaking point.

Notable Sufferers[]

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