you can add a OnTouch script to do that. for example
prontera,150,180,4 script Healer 139,3,3,{
OnInit:
set .seteffect, 1;
while(.seteffect) {
misceffect EF_LG_KINGS_GRACE;
sleep 15000;
}
end;
OnTouch:
specialeffect2 EF_HEAL2; percentheal 100,100;
specialeffect2 EF_INCAGILITY; sc_start SC_INC_AGI,240000,10;
specialeffect2 EF_BLESSING; sc_start SC_BLESSING,240000,10;
}