Seven hours before the Armakea's planned attack on the Eidum's borders, Kyran could finally summon Anan, Eikin, and Tamir. He instructed them to follow Achim's lead before returning to the Eidum's HQ.
Kyran had not fully recovered from absorbing Achim and the others, which was why he wanted to return and ask the old man for help.
The old man was not familiar with healing one's magic core. Thus, Kyran only wanted him to alleviate his exhaustion.