Octarine was a colour that defied description despite many attempts by those that could see it, trying to explain to those who couldn't. That might be down to the fact that both Wizards and cats were notoriously bad when it came to explanations. Purply-greeny-yellow or Meowlwrowl was as close to capturing it as either had got.
But now, Octarine was leaking out from the rimbow and entering painfully into Dulling's mind. He didn't so much see it, as felt it and it felt like his senses were being turned inside out. Unlike Dazzle he was still very much aware of what the book was making him do and what was about to happen. He hung on for as long as he could, teeth gritted, leaning back toward the Disc. "Don't…" He managed to hiss to the 'Colour of Magick'. "Take me! Just take me!" But a readership of one would never be enough.
The world tipped forwards as the book pushed Dulling off the rim's edge, out into eternal darkness.
###
The seconds ticked down, breath was held in anticipation, then as the big hand creaked round to twelve, Old Tom pealed his deafening silence across the square.* At the base of the tower a shadow grew before Dulling appeared, stumbling as if shoved through the bricks themselves.
*Old Tom, like the book trap and Doreen's cage was made of Octiron. The bell had no clapper but made ears ring regardless.
From behind the first stall Ponder turned to the Wizards, Watch and Goblin in charge of the filter and salamanders and indicated they should wait. They couldn't start until the book was opened, nor until the golems were in place. Mere moments passed but they seemed to stretch out for minutes. All eyes were on Dulling who swayed on his feet as if about to go into a dead faint then he rocked back and a shaft of Octarine was released from the book in his arms.
The very next moment a blur of liquid silver seemed to pour from the fountains as the metallic golems threw themselves out of the water and rolled across the square. As soon as they were in formation, pairs in front of each stall, Ponder yelled, "Now!" Angua and Forrest kicked down the stall and 'Turning of the Cogs' poked the Salamanders with a stick. Their tails went off sending light through the red filter, bouncing off the golems and it hit Dulling. The Wizards were able to sustain the light from the Salamanders to make a continuous beam. The goblin shot off to the next stall and again, orange light was beamed towards 'The Colour of Magick'. It was working! Yellow, green, blue; a rainbow was forming brightly across the square reflecting off the mirrored glasses of all present. Two more; indigo, then violet. The two final golems were ready to deploy the book trap.
But something was not right. The Octarine didn't seem to be abating and the ground beneath them had begun to tremor. As the cobbles shook, Otto chanced a glance around the corner, mirrored shades replacing his usual wire-rimmed specs. 'Turning of the Cogs' and 'Petals and Sawdust Scattered' skidded to a halt by his feet. "Mister Otto! A colour is missing!"
"Vot?!" The cogs of his own mind began to turn rapidly. The iconographs! That's why they were dark. "Ve need infra-black! Ve need dark light!"
"Quick smart Mister Otto! We know where to get it!"
They ran, the rest of the goblins following and Otto sped off after them.
###
They arrived at the shop and dashed into the side room. "You haff land eels?" Otto asked.
The goblins tore up three of the floorboards, so that was where they went when they weren't around. There was clearly a living space but also four large crates of Überwaldean land eels. "Mistress told us about the accident. We thought why not try with these little buggers? Not so little eh?" The land eels were like the salamanders, double the size of average.
The goblins took three crates between two and Otto hoisted the fourth onto his shoulder, "Ve must go!" He ordered, leading the way, "Zer book stops here!"
###
Whilst the golems managed to stay upright, there were cracks across the square now and keeping on ones feet was near impossible. "We can't hold out for much longer!" Ponder yelled to Vimes who had begun to accept that this was likely it. He became aware of an itching, dragging sensation on his arm. The scar left by the summoning dark. He turned his back on Dulling in time to see Otto, the goblins and four crates flying across the square towards them.
The crates hit the ground and splintered open, breaking the glass jars and startling the eels. Just as the light from the salamanders began to falter, darkness bloomed like a cloud and spread like a blanket obliterating everything.