Find:
case RK_ENCHANTBLADE:
clif_skill_nodamage(src,bl,skill_id,skill_lv,
sc_start2(src,bl,type,100,skill_lv,(100+20*skill_lv)*(status_get_lv(src)/150)+sstatus->int_,skill_get_time(skill_id,skill_lv)));
break;
Change to:
case RK_ENCHANTBLADE:
clif_skill_nodamage(src,bl,skill_id,skill_lv,
sc_start2(src,bl,type,100,skill_lv,(100+20*skill_lv)*(status_get_lv(src)/150)+sstatus->int_,skill_get_time(skill_id,skill_lv)));
clif_specialeffect(bl,756,AREA);
break;
bl = to target
756 = effect ID (you can change this if you want, find the existing effects at your rathena folder/doc/effect_list.txt)
AREA = where it will be seen