List of monsters/Levels 300+

Level 300

 * Dagannoth Supreme - Level 303
 * Dagannoth Rex - Level 303
 * Dagannoth Prime - Level 303
 * Chaos Elemental - Level 305
 * Kalphite Queen - Level 333
 * Ket-Zek - Level 360

Level 700

 * TzTok-Jad - Level 702