Some patrol the halls, killing any intruders they come across, while others dumbly go about some other task: gathering materials or repairing damage to the tower. Either way, they tirelessly execute their programming. The guardians and workers have distinct runes etched into their carapace, but only the mad wizard knew the difference. Instinct: To implacably carry out a simple task

• Crush and dig with metal claws
• Fix something with metal probes
• Destroy the intruder
• Flee from the intruder, then return to continue working

Svengnärd was so excited to show us that vein of silver he discovered in the new caves. Well, good thing he was leading the way because all of a sudden, he's eight feet up, kicking spastically at the air. We hacked him down, but the other one pulled him into a stinking hole in the wall. Are you crazy? No, we didn't go after him! Once a Cave Fisher pair has brought a meal back to the nest, you won't hear from either of them for a few days. Sven's feeding the grublings now, and I've taken over the rights to his silver. Here's your pickaxe, and take this mutton with you. Toss it ahead at the third archway. You'll be glad you did. Instinct: Feed the grublings

• Strike from concealment
• Drag a victim into the air or down a hole
• Suffocate and consume