Open up channel.xml, choose a channel and set the following:
Code:
rule="elite" levelmin='1' levelmax='99'
Rule being "elite" will avoid exp loss for high leveled players when killed by low leveled ones, "levelmin" is the minimum level a character needs to enter the channel, "levelmax" is the maximum limit of a character to join that channel.
So now, you can have players ranged from level 1 ~ 99 playing in the same channel without any exp loss. Edit your channel.xml correctly, save it and restart the server.
It should look something like this:
Code:
<CHANNEL name="Universal Channel" maxplayers="200" rule="elite" levelmin='1' levelmax='99'/>