Ghast

Ghasts are mobs found in the northern end of the Blazing Fortress at night (9:00 PM – 5:00 AM SkyBlock time) in the sky near the Magma Cube Boss spawn area or from Ghast Minions. While they deal the same damage as vanilla Ghasts, their health has been increased to 330.

Trivia

 * Back in the day, killing Ghasts spawned by Ghast Minions used to be the best method to earn Combat XP. It has been changed so that mobs on your Private Islands don't give XP.