GUIDING STAR.
Level: 3-4
Mana cost: 12-16.
Element: Water
On expert difficulty, it removes the movement penalty in all terrains and reduces the movement cost to 90 movement points per step instead of 100,
+ if additionally there is an expert pathfinding skill, then 1 step costs 80 movement points.
Let's assume the player has 3000 movement points, then the maximum distance they can travel is 3000/0.8 = 3750, and even then, only on difficult terrain, because the bonus doesn't work on roads.
Considering that Teleport and Dimension Door, when converted to movement points, often provide a disproportionately larger benefit, such a spell would not be an overwhelming advantage and would add usefulness to the water element.