Fire surge (requiring lvl. 95 magic)
Purchase runes and cast the highest spell you can.
Probably the very high level fire spell, the new one above Fire Wave, it hits a maximum of 37.
By using the highest level spell you can. Higher level spells give more experience.
Don't Believe there is a specific highest place in runescape, if there is I would say The Death Plateau.
Ice Barrage hits 30 on multiple opponents that's all I know.
Vengence
Go to runescape website and check at highscores. It should be there.
You can the highest you can get any skill in Runescape is 99. And the highest combat level you can get is 138.
The highest it can go to is 99.
without potions, 99.
the person who has the highest stats
126