Poem Found in a Chest Recovered in Eregion

The parchment is written in Cirth runes. There is no signature, seal, or other identifying mark of the author.

sky to peak
peak to pass
pass to snow
winter's wrath
many wailing
many fleeing
pass to plains
rivers go dry
no rest in the south
dwarf door closes
knowledge opens
where is the key?
treasure is danger