From publisher blurb:
The Secret of the Crystal Cave adventure takes place in a branching cave system that presents challenges, both fierce creatures and dangerous terrain, before the heroes can claim a weave shard of their own.
• Adventure with six-eight encounters and eight new maps
• Includes three monsters: Spine rat, viperwing, water beast
• Includes six new equipment: Shimmering shard, focus shard, fractured shard, faceted shard, shattering shard, needle shard