Achilles Heel: Ytterbium Weakness

Achilles Heel: Ytterbium weakness by Dragon blaze 99

Ytterbium (pronounced /ɨˈtɜrbiəm/ i-TER-bee-əm) is a chemical element with the symbol Yb and atomic number 70. A soft silvery metallic element, ytterbium is a rare earth element of the lanthanide series and is found in the minerals gadolinite, monazite, and xenotime. The element is sometimes associated with yttrium or other related elements and is used in certain steels. Natural ytterbium is a mix of seven stable isotopes. Ytterbium-169, an artificially produced isotope, is used as a gamma ray source.

This bizarre weakness makes the character more susceptible X-rays, gamma rays that pass through soft tissues of the body, but are blocked by bones and other dense materials that normal do no damage will go 1D6 damage to the characters Hp every melee round. On top of that true laser weapon will do double damage (starting with SDC) to the character.