From Into the Wilds Wiki

Grayson was a digger that the adventurer encountered in Briudor. The group took him prisoner alongside his friend Berrow for information and then took him down into the excavation site they needed to reach. Here, Maolmhuire worked to recruit the two prisoners for his Cult of Knowledge.
However, blood was needed to activate magical pillars and Datura slit Berrow's throat, killing him and using the blood to activate the gate.
Grayson then had to be forced through the portal, where he died in the fight. Maolmhuire casts spare the dying on him.