I wish for a grappling hook.
This item would be fired like a bow, and if it connects to the target, it would drag the user up to wherever it connects. The user would then need to perform a mounting manuver that enables them to stand on the nearest flat surface.
The item should be available via quest and should not require a mount to obtain.
An example of use:
1. Fire at top of cliff, statue, or tower to get on top.
2. Fire at side of wall to scale it. Once pulled up to the hook, you would need to lower yourself or climb from there.
3. Use it to safely lower yourself down the side of the winch or bronze doors cliffs to explore the chasm below or pick plants that grow on verticle surfaces. (spelunking)
4 Fire at npc or player to pull them to you - or you to them if they are more massive than you.
A Skill level could determine your chances of success, the distance at which you can connect, and your ability to move from the hook to a mountable surface.