Almost all of the Skull Dragon's attacks are status attacks. During its first three turns it either uses a normal attack, Doom, or Will o' the Wisp. On its fourth turn the Skull Dragon targets a random party member and uses Disaster on them, inflicting Blind, Imp, Doom, Silence, Confuse, and Float.
There are two options to kill the Skull Dragon. The first is to use normal attack spells like Firaga, Holy, and Ultima to deplete its HP. The second is to use Rasp to damage its MP, as compared to the other eight legendary dragons Skull Dragon's MP is low. If the player comes in with their party members already low on MP and uses Osmose, it is possible to sap most of Skull Dragon's MP in the first turn. The Rasp spell is even more effective.
As with the other dragons, the Skull Dragon has been upgraded when faced in Dragons' Den. This time the player must deplete all of its MP to kill it, as depleting its HP will only cause it to regenerate. Since it has 14,000 MP this will take a while. As before, most of its attacks are status inflicting abilities.
When defeated, the Seal of Darkness is broken and the player receives Gogo'sultimate weapon, the Scorpion Tail. It is not possible to kill Skull Dragon with Joker's Death; if one rolls 7-7-7 on Setzer's Slot, the dragon will regenerate.
1st Turn: Attack (33%) or Doom (33%) or Will o' the Wisp (33%)
2nd Turn: Attack (33%) or Doom (33%) or Apparition (33%)
3rd Turn: Attack (33%) or Doom (33%) or Will o' the Wisp (33%)
4th Turn: Target: Random Player
1st Turn: Attack (33%) or Fear (33%) or Lv. 5 Death (33%)
2nd Turn: Attack (33%) or Fear (33%) or Will o' the Wisp (33%)
3rd Turn: Fear (33%) or Bio (33%) or Disaster (33%)
4th Turn: Target: Terra
If MP = 0: Skull Dragon dies
If killed (by bringing HP to 0):
Display message: Skull Dragon reanimates! It cannot die while it still has magic!
Revive Skull Dragon
If attacked by anything: Attack (33%) or Fear (33%)