Oodegu is an Orsimer found inside Hightide Hollow. He is the boss of that delve, and defeating him counts towards clearing the Explore Hightide Hollow achievement.
Background[]
In an effort to become powerful enough to challenge the Orsinium hierarchy in Wrothgar, Oodegu used the cave as a place of conducting an arcane ritual. He commanded the Shadowsilk goblins inside Hightide Hollow as he gathered the components necessary to complete his plan.[1]