Dragon gem ghost => imp statue. You need a red and a yellow gem, put it into the statue => you can approach the door where the gem is. Mainentance Tunnels, lvl 1, south part.
Red gem => NE part, where a critter is
Yellow gem => hole with a lot of bones - you have to click on it 9-13 times (either random or luck)
Key for Maintenance Tunnls 2 => you need the 2nd summoning test first. Did you solve the first one?
