Would Thismod work on a server and if so would it be legal in minetown?

It should work and yes it's not against the rules.

But if you want to find slimes, look around layer ~30-. There are always some spawning in Devanhoe's city (/warp atlanta)

Thanks for the quick reply! <object class="emojione" data="https://resources.enjin.com/1489581540/themes/core/images/emojione/svg/1f44d.svg?0" type="image/svg+xml" standby=":thumb:">:thumb:</object> glad to know its not against the rules.

-JJ