The Tide of Years (Penumbra / D20)

A nation falls into ruin when its most treasured artifact - a temporal crystal capable of controlling time itself - is stolen from its sacred altar. Only the guilt-ridden spirit of a dead priest remains to recover the priceless crystal and restore his people to their glory. A group of travelling heroes is his only hope, but they must brave perilous waters to reach the sunken temple where the crystal now lies, radiating a strange energy that has transformed the surrounding forest into a prehistoric landscape. Can they return the crystal to its rightful time?

The Tide of Years is an adventure scenario for the D20 System, published under the Open Gaming License and D20 System Trademark License. It features:

* An opening for GMs to introduce time travel into their campaigns, either as a one-time extraordinary experience or as an ongoing campaign theme

* Time traps the players must think their way through, and dangerous new monsters

* The new clerical Domain of Time, including new spells and a new deity