Sister Orb acted carefully. That Soul Worm was almost fully merged with Diliy's Soul, and its tendrils spread like thin threads to every corner. Even with her meticulous job, damage was unavoidable. That's where Rean jumped in. His Light Element was perfect for the Soul, and at every slight change, it acted, helping stabilize and heal the damaged parts.
Finally, thirty minutes later, the Werdlem Soul Worm was pulled out of Diliy's Soul, being confined by the power of the Celestial Soul Dimensional Realm instantly. Rean could take his sweet time with Zangeshu later to analyze it further.
Rean worked a little bit more on Diliy's soul, helping him to further stabilize his condition. He did his best, but souls are delicate things, so even his Light Element had its limits. If he was at a higher realm, it would have been much easier, though.