ToME: the Tales of Maj'Eyal

Opened a glowing chest:

The unstable sand tunnel collapses!
An object rolls from the chest!
You can't use this talent while holding a weapon or shield.
But the chest was guarded!

What talent?? I'm a Cornac Bulwark if that makes any difference.

Were you in the sandworm lair? It seems possible that in the turn you opened the chest, the loot popped out, tunnel collapsed on it, it tried to spawn guards but couldn't inside the wall? Sounds weird.

I worked this 1 out or 1 version of it at least. The chest can spawn a unique with a 2hd weapon & brawler talents.