In the north-east of RuneScape there is a region where players may fight other players. This land is known as the Wilderness.
At the southern edge of the Wilderness, you may only fight players whose combat level is close to your own. As you go further north, you become able to fight players with a wider range of combat levels. this means you might find yourself attacked by players who are considerably stronger than you, so watch out!
If you get killed you will drop everything except your 3 most valuable items. However if you attack another player who hasn't recently attacked you, you may be marked with a skull for 20 minutes; you will drop ALL your items if you die whilst you are skulled. Anything you drop on death will normally be awarded to the player who did most damage against you; your gravestone will not appear in the Wilderness at all.
The Protect Item prayer allows you to keep one extra item of death, so you will keep one item if you use the prayer while you are skulled. On certain game worlds, the Protect item prayer may not be used in the Wilderness!
If you drop items on the floor in the Wilderness, other players will be able to pick them up immediately, so don't drop anything you want to keep.