Unseen in one of the houses.
Unseen are invisible mobs that haunt Raven Hill of Duskwood. They are neutral unless attacked, but since they are invisible to the naked eye most players are totally unaware of their existence. Warlocks who can cast Detect Invisibility, or other players using various means to detect invisible mobs, can see them. In addition, they do not become visible when provoked.
They are extremely dangerous since they are levels 49-51 and Duskwood is a level 18-30 zone, so they are much stronger then most players will be. Since they are invisible and neutral, this is usually not a problem, but mages and any other class that uses an AoE attack in Raven Hill has a good chance of accidentally hitting one of the invisible Unseen and getting an unpleasant surprise.
Flares and tracking do not work, warlock buffs seem to be the best bet, if you wish to see them.
Technically 'Unseen' are easter eggs - something hidden and players won't normally think of looking for or doing.
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