You were a puppet created by Ei, just like Scaramouche. You were meant to help him with the gnosis but went with him when EI didn't give it to him. You, Scaramouche, the Traveler and Paimon went to the Irminsul's heart. The Traveler and Paimon were talking telepathically with Nahida and Scaramouche was looking for information in the Irminsul.