To reproduce, make sure you have two newly-exposed, non-reinforced normal earth walls a moderate distance apart. Place a conduit so that it covers one wall but not the other. Pick up all your imps, then summon two more so you have two lvl 1 imps with 0 XP. Place one imp on each wall. The imp with the conduit will finish reinforcing faster.
I think this is a bug, or at least a balance issue, because
- The conduit description says that it speeds up mining and claiming territory, and says nothing about reinforcement.
- The conduit is in the vein of Wrath, which isn't meant to focus on reinforcing walls.
- Reinforced walls improve room efficiency; if Conduit makes it faster to get a fully-reinforced Archive at the start of the game, it's a must-pick aspect.
Customer support service by UserEcho