That was what I wanted you to think. It has nothing to do with rainbows or caves, and is a simple one-word answer. Sleipnir was a mode of transportation that bore Odin. The answer to this bore the transportation (here meaning The act or an instance of transporting), or in other words, held his journey. I should also add that Odin did this journey to obtain wisdom of the Great ______.

I will give better hints later... I wanna make you suffer.