Alter Aeon Online Help

Keywords are:  'noksteal nokillsteal'

The 'nokillsteal' command allows you to turn kill stealing on or off.

Kill stealing is what happens when someone else attacks a monster you are
already attacking and lands the killing blow.  Since most of the experience
for fighting a monster comes from landing the killing blow (unless you are
in a group), you may do most of the fighting while the other player gets
the experience.

Using the 'nokillsteal' command, you can prevent others from joining battle
with you unless they are in a group with you.  Note that in certain groups,
the group leader may require you to allow kill stealing, to help interact
with other groups.