Restless Spirits an adventure for 3rd-5th level characters

Summoned by a council of elders, the heroes of the tribes are assembled to investigate a growing number of spirits manifesting near the Viel Between Worlds.  Previously benign spirits have been malevolently attacking the denizens of the jungle and even members of the Loactha tribe who live closest to the Viel.  Why are the spirits angry? How are they crossing between worlds?

Total Word Count: 10,000

Hooks (500 words)
Call of the Tribes.
Foreign Intervention.

Background (500 words)
What is the Viel? What happened to it? What attacks have taken place?

Gather Info/Bardic Lore (500 words)
What is the Viel? What is known about the Spirits?

Major Locations/Encounters - bulk (7,000 words, 5 encounter areas)

Through the Jungle (1-2 encounters)
Loactha Tribe (RP encounter)
The Viel (location encounters, 1-2)
Beyond the Viel (location encounters, 5-7)
The Nexus (final encounter)

Conclusion/Further Adventures (500 words)
Using the Nexus

New Monster/Magic Item/Spell (1,000 words)
Spirit Creature template
Bone Spike (bone toothed kama or sickle)
Spirit Ward