This is the conclusion to the Prophecies of Redemption Campaign. The characters have sojourned through mountains and lowlands to reach the forest in which the entrance to the demon lord’s citadel can be found.
But the Citadel is not what one could expect. Can the PCs find their way in and survive to tell the tale?
The spirit of a creature trapped in amber cannot escape to it’s afterlife / next incarnation / whatever.
Such trapped spirits can be contacted by those who know the right rituals and magical power derived from them – typically the power to control one individual of that species.
Can by quite powerful if the creature is a colony insect (ant, bee, wasp, etc) – simply control the queen and you command the whole colony.