I'm stuck on the first level of Watcher's Keep. I killed all the statues, but lost 4 party members in doing so, so went to my pocket plane to rest in safety. When I returned, I've found that the portal won't let me through, as it still claims the statues are protecting it. I've read that there's a statue which is permanently invisible, but I've gone through the entire level casting invisibility purge, and other invisibility detection spells, and haven't found it. I'm not sure if the game is broken because I went to the pocket plane without using it after killing the statues, or if the invisible statue isn't showing up to anything for some reason. Is there a known solution or workaround, or do I need to go back to my save outside the keep and start again?