A trauma symbiote is a piece of living spellware that can absorb damage, thus saving yourmiserable skin. It has ten wound points, and will take damage off these wound points before any damage is applies to you. The attack that brings the symbiote past it's wound treashold is always fully absorbed, but after taking this damage, the Symbiote must make a DeathTest, comparing the excess damage to its wound point rating.
It is possible to bye this schtick several times; each additional time after the first adds another five wound points of absorption.