Don’t have an open 2x2 space in the Gnome King’s Wine Cellar where all the gems and luckstone are stored. Leave the gems where they are, but embedded in solid rock. Possibly, there should be an engraving or two on the ground saying something like “we have almost reached the mother lode”, to compensate for the lack of an obvious reason to mine into that area when magic mapping will not show anything. Also, guarantee a pick-axe on the level, possibly only if no dwarf generated there with a digging tool.

This is intended to replace the current solution of guaranteeing a teleport scroll in the 2x2 space, which is intended to prevent the hero getting stuck there with no way out, but isn’t a perfect guarantee. (A monster could spawn there before the hero arrives, pick up the scroll, and use it after the hero arrives, or the hero’s teleport could be incredibly unlucky and randomly pick one of the spaces in the 2x2 area as its destination).