Apart from the Skeleton Giant, there were also a few other Bosses.
There were also skeleton soldiers, the Headless Horseman, the Skeleton Summoner, the Skeleton Mammoth, the Skeleton Warrior, the Cataclysm, and so on.
They were all Silver Bosses around level 30.
Headless Horseman: Silver-level wild monster
Level: 30
HP: 160000
Attack Power: 150
Defense: 120
Skill: Death Charge uses Undead Energy to enhance its speed and strength. The attack power will double, and at the same time, its impact will also increase greatly. The target hit will be stunned or sent flying.
Death Reaper. The spear in the Death Knight's hand sweeps the surroundings. There would be a rich undead ability on the spear. Be it undead creatures or living creatures, after being slashed open, it would absorb their life force and recover its health. If its health was full, it would increase its attributes.