Grendel

Grendel is a human cleric of Ethan Dragonslayer who accompanied Trevor and Sam to fight a green dragon, then disappeared mysteriously. Until his disappearance, he lived in the Church Quarter of Malvont

Description
Grendel was a young male human with extensive knowledge of anti-dragon tactics and strategies. Despite his information, he had only killed the one dragon required to join the Cult of Ethan, and was mostly a researcher for the church. He wore all black.

In Aegis
Grendel volunteered to help Sam and Trevor test out the lantern they found to see if it was indeed a lantern of dragonslaying. He led them to the lair of a small green dragon near the southern shore of South Goneril. Within the dragon's lair was the massive skeleton of a much older dragon. Working together, the three defeated both dragons, then returned triumphantly only to discover that the city had been attacked in their absence. What's more, the attacker had come from the same direction as the party.

After the party was cleared of suspicion, Grendel disappeared. He had personally suggested the location of the dragon lair, but when the elders went to check, that dragon lair was not on the Dragon Battle Board maintained in church headquarters, which should contain the locations of all dragon lairs known to current clerics of Ethan. Grendel's whereabouts (and true identity?) remain unknown.