Copper construct

Copper-coloured and lozenge shaped, this creature seemed to emerge from an egg of some sort.

Made of metal, and mechanical. Was able to phase in and out of the physical world and could leap 10' as a reaction to being attacked.

When destroyed, the creature fell to metal pieces and emitted a strange, purple, viscous goo (which behaved like custard). Amongst the wreckage was found a Codex tube.