Stupid

In the beginning, the Boss' HP was manageable for everyone. At every 20% HP interval, the Boss' HP would be locked. They would need to deal Ice damage 255 times to the Boss, after which the Little Slime would split into water droplets. Then, these water droplets would be able to be attacked.

If these water droplets were not killed before they grouped together again, the Little Slime would be reconstructed back to full HP and full mana, which would mean that they would be back to square one.

Only once they cleared a certain number of the droplets, would the Slime return to its HP. For example, the first successful clearing of the water droplets would bring the Boss to 80%, then 60% and so on. However, once it reached 60% HP, the Little Slime would lock its HP, which meant that they needed to deal Ice damage 255 times to the Boss again.