Summarizing...
The Taumet Codex: This tome appears well-worn, burnt, and partially destroyed. Over the years, portions of the book have been lost (perhaps intentionally), and it has been rebound.
The Taumet Codex is an evil minor artifact whose purpose is to assist the Taumet Relics into forming the Taumet. The tome describes the relics and some of their powers, but hides the fact that they are intelligent and seek to take control of their bearers.
The last stained and partial section of the Codex concerns the creation of the Taumet, and is little more than a phonetic speech (in an unintelligible, forgotten tongue) to be read out in the presence of the wearer of the relics. "The Taumet", says the text, "will then be released upon the World and all its kindred." Anyone in possession of the complete set of Taumet relics is forced to read this passage, and will begin the transformation into the Taumet.
A nonevil creature not currently in possession of one or more of the Taumet relics suffers xdx points of damage each round the Codex is handled. Should the same creature attempt to read the Codex, a false lindworm (of random color) is instantly summoned and attacks the reader. The false lindworm fights until either it or the reader is destroyed. Should the reader survive, and attempt to read from the tome again, another false lindworm is called.