A lot of reading is involved
If Klaus used Elena to create a hybrid of werewolf and vampire. Then Doppelganger blood can be used for spells. I'm wondering on what Silas will do next season? Elena Gilbert - Doppelganger of Tatia ( vampire ) Katherine Pierce - Doppelganger of Tatia ( human ) Stefan Salvatore - Doppelganger of Silas ( vampire )- Here is what i think he will do in Season 5
Thus making 3 doppelgangers in mystic falls and Katherine is the only one that is human now that she has taken the cure.
Will Silas make a hybrid also. But this time Vampire/Warlock ? I mean... I know things don't go well together seeing Warlocks and witches go with the balance of nature and don't like Vampires because they are techincally dead and an abomination of their creating. But if you know the movies and books Werewolfs and Vampires don't go well together. Werewolf being able to kill them in one bite during a full moon. Stefan probably had the Warlock gene when he was human. Just like how tyler has the werewolf gene. Quote from Katherine " The werewolf gene runs in the Lockwood family not that they are all wolves " If Silas can activate that gene maybe it's possible for him to make a hybrid of Vampire/Warlock. Emily did say to Stefan the day he turned " Your heart is pure Stefan, That will be your curse " Now why would Silas even begin to create such a hybrid? Klaus wanted his hybrids to build an army so no one dared to pick a fight as he said. Klaus had enemies so having hybrids wouldn't be that bad. His Mother ( Esther ) tried to kill him and his family , His father ( Micheal ) tried to kill him and his family as well. Now Silas's Enemy is well. I think it could probably be Klaus's child. Despite him being in " The Originals " spin off show. If you taken research into Season 5 episode 1. Nadia comes to give a Ominous warning to Stefan ( Silas ) about the Originals. So I'm guessing both the shows are still very much connected. So one option could be Klaus's child and Another one could be Stefan ( when he gets out of course ) talks to a witch outside of town and tries to link Stefan to Silas. Just like how in Katherine got a witch to link Elena to herself so the Salvatore brothers wouldn't kill her. Then Stefan tries to kill himself which is a far stretch but i can see it happening at least hurting Silas to an extent where he would be vulnerable. and Let's not forget how Bonnie stopped Jeremy's heart and Klaus at the same time using a spell. What do you think? Will Silas just merely have fun causing havoc at Mystic Falls now that he is finally free and the cure is already used? Or will he have a masterplan that he was preparing for 2 milleniums?