Tabula Rasa has 6 linked white sockets, but provides no defence values, even no base values of a Simple RobeSimple RobeEnergy Shield: (14-20) Movement Speed: -3%Requires 17 Int.
Jack in the BoxJack in the Box4ItemTurn the crank, close your eyes, and pray to the gods for a pleasant surprise.
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Singular IncubatorSingular IncubatorStack Size: 10Adds an incubated Unique item to an equippable item Item drops after killing {0} monstersRight click this item then left click an item to apply it. The Incubated item drops after killing a specific number of monsters.
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The VoidThe Void1Reach into the Void and claim your prize.
Tabula Rasa is an item where theme trumped the general rules in the game slightly. The entire theme of the item is that it grants no stats, so as a result, there's nothing on it to describe exactly what it does, which can make it a little confusing for players who find one while still new to the game.
The (hidden) modifiers on this item cause it to have no defenses - not even the base values that would be on a normal Simple Robe, and cause it to always have a full 6, linked, white sockets. White sockets can accept gems of any colour, making it easy to link lots of gems together, since you don't have to care about finding items with the right colours on their sockets to match the supports you want to use.
Like a literal blank slate, the item does nothing on it's own, but has lots of potential, depending on how you chose to fill it up.
Practically, it offers offensive power (easier to get five support gems on you main skill) at the cost of defenses (item in body armour slot isn't helping keep you alive). It can be quite useful while leveling new characters through early content, and for experimenting with different gem layouts for future builds, but is unlikely to do well in endgame.