A buff that makes the effect of vision lasts longer. The higher level it is cast, the longer the effect works. Eg. at the lowest level it lasts for 5 minutes and then increases 10 for each 25 levels.
This would mean that you can see where you have walked on the map. This could be useful for hunting when you are in a dark realm and it could also be useful for titan hunting in a dark realm.
Virtually yours,
Zennaro