[Davood]

that would be an excellent addition to any custom server!

you could do this by adding some code to the experience module for the server; however perl might be preferable for easy mass distribution of said content, and would might be easier to maintain and test, since you can reset the perl cache while the server is running.

I think the experience method might be best, so that way you can "tag along" on the kills, and you won't necessarily have to make all the killing blows yourself

unless of course there is a way to inject something into the "on gain xp" with perl for all npcs...