The Fourth Book of Hsan

The Seven Cryptical Books of Hsan are ancient scrolls penned by Hsan the Greater over two thousand years ago. Each book has a different topic and contains discussions and instructions to execute spells and rituals related to that topic. You have successfully researched the Fourth Book, which examines entities of the earth and subterranean areas. You gain Darkvision (60 feet) and make spell attacks with Advantage against Goblins or anything that lives underground. You make any knowledge- or research-based skill check involving digging, tunneling, the Underdark, goblinoids, and/or earth (or similar) elementals with Advantage. You gain a +2 bonus to Insight and Nature. Add 1 to all future Wisdom saves for this item.