What are the Blue drug potions for?? And the purple potions?? And the purple elixers??

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How do u make strenght potions??

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How do u get in the cave in the dark forest?? You can get in the first part but u can go throu theres a wall!!??

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the sword in the stone should i pull it out and use it ?? And how do i kill the ghost that comes out?? Or should i leave the sword in??

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After i kill Cebu ( the assassin that killed the duke Ferol ) will i have anymore contact with the assassins gile?? How do i meet the grand cyclopes??

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will i be able to open the door to Zandilor in the prison?? or do i have to be thrown out of the castle first??
=============================================================================I know who killed Duke Ferol but will i find out who ordered his murder??
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Thank You anyone who will and has helped me!! Helps alot