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Much like Zerns, Bladers are also affected by spells that worked on demi-humans, so they were classed as demi-humans.
Bladers are insectile species whose fingernails sprouted knife-like blades and whose bodies were protected by an armor-like exoskeleton. 
Bladers had defenses which rivaled that of plate armored demi-humans.
- Cocytus's exoskeleton-type armor is similar to a Blader.