Jack saw large damage numbers appear above Master's minions once the hall turned into an ice world. All the shadow creatures were killed. Some of Master's weaker minions which had previously received damage from Euphosine's ice chains were also killed. A good portion of the surviving ones was frozen. The rest were significantly slowed.
As for Master's heavenly shelter, it crumbled after a while. The residual ice energy assailed Jack and Master. Jack activated Gold Scale Armor when the shell was destroyed, while Master was still protected by his ice armor. Even so, both of them still suffer damage that took out almost one-third of their lives.
Master had leveled up the heavenly shelter to the max. At level 20, Heavenly Shelter was able to sustain damage equal to 1000% of his HP and reduce the remaining damage by 80%. Master had 65,000 HP. This meant the damage that hit the heavenly shell was way more than 650,000 HP.