From publisher blurb:
In Arcane Containment Ward, a level-5 epic adventure, the characters are hired to investigate a crumbling dungeon beneath the largest tree in Dryads' Forest. According to the court seer, an eon-old prison lies therein. A terrible threat from the dawn of time has been imprisoned there for millennia. The wards that keep this primordial being in place have worn off after such a long time. The characters must fix this situation.
When the characters visit what little remains of this containment unit, they find a Primordial Slime close to shedding its magical shackles. The characters must act fast and find the magical ritual in the dungeon to restore the arcane wards to keep the primordial in check. Should the characters fail, they may bring about a world-ending threat.