- Small Light is a light element spell
- The lever in Crysthaven simultaneously opens one path and closes another.
You needed to loot everything from the open cage first, before bulling the lever and looting the second.
If you pulled the level as soon as you saw it, you locked yourself out of the first room, and you can't get into it anymore.
- It's completely normal that monsters that you captured with Soul Lanterns don't return.
You can release them at the monsterhall or one of the farms for it depending on the race, to get their drops without having to fight them.