Glowing slime

Glowing slime exists in the Deep Roads, a source of danger to Miner caste dwarves as well as any creatures living in the deep. The substance is legendary amongst dwarves, and many miners tell tales of workers becoming disoriented and following a glow they imagine to be a lamp, only to find it is a blue-green slime that clings to rocks or collects in pools of water. When it detects a living creature it attacks. The slime envelops its prey, dissolving them with acidic secretions. The substance resists physical and even magical attack. Dwarves believe this is because the slime leeches lyrium from the stone of the tunnels, perhaps explaining the blue-green color of the slime. Fire and salt are capable of injuring the slime and thus some miners place trails of rock salt in passages and doorways to defend against the ravenous slime.

Glowing slime is neither intelligent nor sentient, it merely reacts violently to the warmth of living creatures.

Trivia

 * Owing to its vulnerability to salt, the slime exhibits some attributes of a slug.