Rumiese:
Are you really ready, physically and mentally? Do not underestimate Istina's power, especially here on her home turf.
If you still believe you have a chance, we will help you by weakening Istina with the magical power Ballista.
Istina's creative power is generated by the soul stone in her body. Regular attacks won't even scratch the soul stone, but by concentrating your magical power into a huge attack with the Ballista, we can damage her. I will give you more details once you are inside the cavern. Are you ready to enter now?
Also, do you have the Energy Control Device? You will need it for this fight.

By the way, I can exchange Istina's Accessories for something better for you. But keep in mind that the enchantment in the accessories will be reset.
"I want to go inside Istina's Cavern." "Send me into Istina's Cavern (Epic)." "Huh? Energy Control Device?" "I'd like to exchange a Bottle of Soul and a bracelet for a Refined Bracelet."