Agate (ghost)

Agate is the spirit of a dwarven warrior who was left to defend an abandoned dwarven stronghold. Of the three spirit guardians, she was known to be the oddest personality. She fought alongside the other guardians against the town of kobolds that had made their home in the ruins of the stronghold.

The adventuring party opened the dwarves' locked treasure vault and found the crystal that kept the guardians' spirits tethered to this Material Plane. Agate initially fought against the adventurers, but offered to leave in exchange for the crystal. Helike offered her the crystal, which she swallowed into her material armor. She then announced to the kobolds that they are free to live in the castle and left. The other two spirit warriors, also tethered to the crystal, were forced to follow her spirit.

Trivia
Agate is named after a legendary dwarven fighter. She also shares the name of Carnelian's half-sister.