Solution to 5: Shed a Tear for Fallen Heroes
All of the locations in this puzzle are cities/towns in the United States. The below symbols are achieved by mapping each set and connecting the towns in order. The towns "Oslo", "Stockholm", and "Oulu" hint that the puzzle relates to scandinavia in some way, "Heroes" refers to Norse Mythology, and the symbols from the map are runes of the Norse god Tyr.
In Norse Mythology, Ragnarok is considered the one event that is "inevitable", which is what Tyr is referring to in this puzzle. Tyr is addressing his foe, Garmr, who is said to have consumed him during Ragnarok. Garmr is described as the guardian of Hel's gate, therefore the answer is "hel".
HEL