Asa

video|right|300px Asa or Aca is an anthrophomorphic seagull, who lives near the Bay of Arachay. She or he (sex unknown) happens to be one of the rare surviving creatures in Continent Jagga, who, on the top of that, even knows the way to the Underworld.
Then again, Aca might just have been in Lisa's imagination. Koda has commented on Lisa's love of seagulls and how they represent the borders between reality and dreams. Since, after Koda's death, Lisa was unable to reach anything they had as Soul Sharers, Aca might have been a visual representation of knowledge already embedded in Lisa's mind, she just wasn't able to reach it. 
In other theories, Aca was probably sent by Nerros and Syrangani, the neutral aiding force. Nerros and Syrangani sent Aca , as it isn't any of the known persons Lisa and Koda would share (Elyssa, Sitka, Aryadne, Bram) and he probably enchanted it so Lisa would trust it. Either that or Lisa was in such emotional and mentally upset state she didn't doubt the bird's words and decided to trust Aca even if trusting a strange talking bird who just seems to know the location of the Underworld entrance isn't exactly Lisa's cup of tea. 
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