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Can appear for selection at Deaths of Chromie Scenario by using Areias do Tempo

Have chance to drop several items to make Chronoportal challenges easier/shorter.

Pedra-da-lua de Tyrande - Use it after you teleported into portal. Hippogryph will fly you to end.
Documentos do Círculo Cenariano - Speaking with Adrine Towhide will instantly finish that one.
Sinalizador Sulfúreo - When you use this, last rare will instantly spawn
Chave do Portão de Stratholme - With this key you can open the Market Row Gate to reach final rare without doing all the quests.

I personally think Chave do Portão de Stratholme and Sinalizador Sulfúreo is the best time saving.
Pedra-da-lua de Tyrande can be also good time saving if you cannot skip the Abyssal Doombringer's on start. (Abyssal Doombringer's can be skipped if you stick on the left side, ofcourse you have to wait sometime to have enough distance.)
You may think Documentos do Círculo Cenariano is the best one but please consider, you can loot a lot of Areias do Tempo during that challenge.

Good luck,

P.S.- Just in case if you are looking for more of Areias do Tempo then you can always kill rare mobs which is Punhálgido, Sangrentauro, Assolaosso, Quebra-gelo, Dregmar Marcarruna

ATTENTION! You get Desvarios Rabiscados by opening Caixa de Lembrança Perdida no Tempo on first quest... Its because you didn't discover Chronoportals, or you didn't do pre-quests for Chronoportals. Once you discover everything, box should contain item.

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Caixa de Lembrança Perdida no Tempo