Rare Items

Dragon Egg
Take a look at the Dragon Egg link for updated information.

There is only one of these in the world, presuming not destroyed.

Daenningas' Head
Given out by Daenningas to the victor of the Kill Your Admin 2020 event, AL3CL.

Cod Spawn Egg
On October 18th, 2002 Daenningas was in The End as the ocean was finished. He had a cod spawn egg in his inventory when he switched to survival to allow three competing players to kill him - Hormel Beans, Ichopu and Satrix. Ichopu got the kill, however Satrix picked up the cod spawn egg.

Barrier Block and others
Cross reference to Server Exploit History.

On October 28th, a new player, VACed, found a bug in the vote plugin, consisting of being able to drag any item that was in that GUI into the player's inventory, making it a ghost item. Somehow this player managed to transform the ghost item into a real item.

Some players had access to at least 1 barrier block and 1 glass pane with colored writing (an item impossible to achieve without access to the creative mode, however, harmless).

Players who had temporary access to the barrier block, comment that the item was missing from their inventory after relogging.

It is worth noting that all this happened under the nose of Daenningas, who, as can be seen in the screenshots, was flying innocently close to that player and all that uproar. Daenningas later said that he only discovered what a barrier block was after that day.

There is one barrier block still in the game. The location is shown in the screenshots: