Once everyone had identified the weak points of the ice mountain before them, they prepared to excavate and open a passage leading inside.
The method they ultimately adopted was for Alka to use the Cross of Righteous Fire. Relying on his already adept control, he shot out a thick column of fire.
He relentlessly burned the ice mountain in front of him, causing it to begin melting. After a period of burning, the others would start excavating, repeating this process over and over.
Without the flames, the ice's hardness was indeed difficult to break, greatly limiting their excavation speed.
Using this method, they cooperated and spent about two hours. Alka's Magic Power began to wane, becoming insufficient to sustain the flames, so he waved his hand, indicating he needed to rest.
Although he hadn't maintained the flames continuously for two hours, the extended period of sustaining the fire still consumed a great deal of his Magic Power.