How does Riki hear Kallian in the Bionis Interior in Xenoblade Chronicles after defeating Lorithia?

Answer 1

When the battle ended, and Kallian had died, his and Melia's spirit connected in an encounter outside of time. The coming and going of spirits bonded by a deep love has such a mysterious power.

However Riki sees as Melia does, in my own guess, because he is a simple creature. His connection to the cosmos hasn't been bread out by the high sings of culture created through centuries of human ingenuity.

Hope this helps, cheers!