Teleport	Not really an attack, but a skill the Goblin King utilizes in annoying you. When he gets low on health or seeks to get away from you, he'll teleport to a randomly chosen spot in the arena. Be it up top center, bottom center, or the left or right sides.
Blizzaga	One of his spells that he casts. It can easily be avoided when you see the ice cubes forming around your feet. Move out of the way and move in and attack.
Poison	An annoying spell with an obnoxiously big range. When you see green murky bubbles come up from under your feet, move to the far side of the arena to be safe and try to attack the King from behind.
Staff Strike	An attack he only does when you try to attack him when he's not casting a spell. He'll smack you away with his staff and stun you in the process. Its very quick and hard to defend against. So its best advised to not be near him when he's not casting a spell.

Later Cycles: He won't get much stronger in later cycles, however he will add several new spells to his arsenal including Fira and Thundaga. Furthermore, the Goblin cohorts will start appearing more frequently and attack with more fervor. Its best to eliminate his teammates before going in to attack the head honcho.