Des Por

Sometimes it is really annoying for a party of adventurers to find their way through a labyrinth of a dungeon to find the ladder that leads down to the next lower level. However, this worry is past once they have a spellcaster in their midst with Des Por (Downward Movement). Once known as Z (Down), it essentially allows the party to sink through the dungeon floor to the next lower dungeon level.

The spell Uus Por does exactly the opposite and enables a party to quickly move up a dungeon level.