Once the group reached the end of the corridor, even though the secret passage wasn't in the same position as the White Griffon's, the activation mechanism worked the same way.
One of the stone blocks hid a mechanical switch that released the lock and the wall moved with but a gentle push thanks to its well-oiled hinges. Everything was mechanical in nature so that it would work even during a power outage, making it outside Hystar's senses.
The stairs turned out to go down, making Lith inwardly curse. Those going up weren't visible on the map, requiring more time and exploring to find them.
'You guys stay here.' Vladion said after putting the wall back into place. 'We can't afford the undead smelling you or detecting your presence with their senses. If they are as hungry as I expect them to be, the slightest hint could give you off.