unless you want to die...NO!
ofcaurse he or she can level 60tys can heck i can and im level54
in the deep wilderness against greater demon level 92
I would say you should be level 50+. You could be lower but with better food.
erm your supposed to kill Elvarg which is lvl 80+, close to a lesser demon which is also about the same level In melzars maze you have to kill a lesser demon to open a door for a map piece.
by magic
The Sword you used to kill the demon with, the sword is good against demons.
You simply right-click them and select (Attack Dark Wizard Level-7) or (Attack Dark Wizard Level-21) Just like a normal monster. If you haven't gotten Silverlight yet do not attempt to kill the Demon.
you need at least a mithril armour to prevent dark wizards to attack you. With silverlight , you can kill it by 1 shot. (silverlight is weakness to any demon , including the demon you have to kill in mezler maze when you do dragon slayer.)
At your level, I would say killing Experiments ( Level 25 - 100Hp = 400exp per kill ) near Canfis.
train kill stuff
3, there are safe spots there...
Fire giants are level 85 in Runescape 3. They grant 424.8 experience points per kill.