The Archie pet is an item that can be found while training Archaeology. It can be inspected to unlock the Archie pet.
Gaining this pet is based on the amount of experience awarded at once; the more experience granted per action, the greater the chance of gaining this pet
Mishkal'un Dorn is a member of the Dagon'hai order; he can be found in the Tunnel of Chaos. He uses his magic to grant him the specific ability of seeing into the future, reading people's minds of what they are about to say, and answering them before they even say it. He has no use besides talking to him at the moment.
The Unforgiving Desert is a book found in the Grand Library of Menaphos. It is obtained from the first bookcase on the western wall in the north-west corner of the third level.
The Second-Age mage mask is a piece of tank armour from the Second-Age mage equipment set, and is a very rare reward from opening a master reward casket.
An instance shard world is a world (or server) sharded off from the rest of the servers. A player cannot access an instanced shard world except through specific means such as activating a trigger or teleporting to said location.