This article is about the Nexus Tower Sentinel Guard, Yawny Goodknight. You may be looking for Sentinel Guard, a pre-alpha NPC in Nimbus Park. You may also be looking for Sentinel Faction Guard, which refers to the NPC Guards in Avant Gardens.
Yawny Goodknight is a Sentinel Guard NPC located at Sentinel Checkpoint in Nexus Tower. He plays no role in the game other then being part of the achievementSleeping On the Job. To get the achievement, players must use three quick chats that have loud noises to "wake him up."