He is easy to kill only level 20, you have to be a woman in Runescape to get to him though, my guesses your doing the recruitment Drive Quest.
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IF SIR LEYE IS NOT THE ONE YOU HAVE TO KILL FOR THE BRAINS TEST, THIS ANSWER IS WRONG To beat sir leye, you must be a female.
The best monster to kill in Runescape would be the King Black Dragon.
Sir Vyvin can be found on the second floor of Falador castle, to the east.
No, you do not.
At your level, I would say killing Experiments ( Level 25 - 100Hp = 400exp per kill ) near Canfis.