The heroes decide to make their stand after crossing the bridge. The gargantuan skeleton follows them closely, shooting lightning bolts at their wake, and crushing everything under it's feet. As the heroes approach the bridge and cross it, the creature doubts for a moment, but it's madness overrides it's caution, and soon follows, stomping the bridge as it goes. Crossing the gate, the heroes brace themselves for the final round. "We'll take care of that they come back, we're in pretty bad shape anyway." Kaedyn says, and along Binwin, they run towards the ship.
The creature stomps, and puts it's skeletal foot on the grass on the other side of the bridge, when the ancient runes of the Calishites, placed upon the bridge glow strong. Spellhold used a pretty efficient system to keep prisoners withing the island. Inmates in this place where dangerous and powerful spellcasters, so a golden ring was set around their necks. A magical ring. It was linked with ancient enchantment placed on the very stone of the prison; on the very island. The rings worked as channelers for the enchantment's power, funnelling the destructive energy into the escaped prisoner's head. There were several infamous spellcasters that manage to breach out of Spellhold, but made it to the bridge. And them...
A blinding light burst out of the golden ring the creature had around it's neck. Bone fragments shower off over the heroes, as the skeleton is shattered and almost destroyed. However, the creature is too strong, even for the ancient Spell, and now crawling, with no legs, and one arm remaining, it approaches it's shattered skull towards the heroes, the broken crystal shinning weakly.
OOC: I love Anguish's cynical comments; I'll give you XP if I could. Roll initiatives, for this the truly, truthful, definitive final encounter! =)