Cant transform Abyssal Cultist

[Former user]

I am unable to proceed through the story because I can't transform into an Abyssal Cultist and pass through the first force field. In front of Utira Library I chose to battle Damien when provided the choice and remember having the text state that I obtained the Abyssal Cultist's Hair after defeating him. However, there is no choice to transform into the Cultist. There are only the options for Darkai Cultist and Seed Flare.

https://bitbucket-assetroot.s3.amazonaws.com/PInsurgence/insurgence/1450663171.64/1338/Abyssal%20Entrance.png?Signature=jTuCQl8eMd4osY5Ro7oWiTlvaZA%3D&Expires=1453744880&AWSAccessKeyId=AKIAIWY5XSVPZPDQYRQQ

1.1.7