For those who don't know much about scripting you might like this.
Script 1: Run this on your main account.
onhotkey f5 ;just set this key to whatever your wither button is
set *999 Wither
Script 2: Run this on your necro "bot"
loop:
finditem XXXXX ;char number one's #charid
if #finddist > 1
event pathfind #findx #findy #findz
if *999 = Wither
{
set *999 empty
key F5 ;again, set this to your wither key
}
goto loop