ToME: the Tales of Maj'Eyal

Recently came across a cloak drop, not a bright orange randart but whatever you call those paler colored randomized items dropped by unusual enemies.

It included a Grants Telepathy: humanoid/orc ability.

This was in the maze, so I thought - great! It can help with all those bandit/assassin types around here.

But it didn't - as far as I can tell, the ability didn't work whatsoever. Even on a straightaway, with poor visibility (I'm carrying that spider egg artifact around - so it's dark until I light things up with something) I don't see them. (I do see them fine once I light things up though.)

Am I missing something, or is this a bug?

That slash denotes type and subtype; your rare item gives telepathy for humanoid/orc, i.e. humanoid enemies of subtype orc. The rogue enemies, I'm pretty sure, are all humanoid/human.

Ah, that explains it! Thanks!