“Hilund Favor” is a Misc quest in Skyrim - Dragonborn
There are a number of places that have the Spears around the Island. You can find a large number around a hidden Dark Elf Camp. A good number can be found throughout Bristleback Cave. Nearby the Northshore Landing, stuck in a chest. You can find more in Broken Tusk Cave, Frossel, Castle Karstaag Caverns,Castle Karstaag Ruins, Moesring Pass, Fahlbtharz, Glacial Cave, Benkongerike. There are 3 unmarked locations where Rieklings can be found.