- the mvp_sd is removed when the mob is the emperium and there's no killer/exp-awarded (assumed killed by script), this prevents the on-kill event from triggering and giving the castle to whoever damaged the most the emperium without destroying it.
git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@7208 54d463be-8e91-2dee-dedb-b68131a5f0ec