Открываем ../src/map/skill.c и в функции skill_castend_nodamage_id меняем:

	//Skill is actually ground placed.
	if (src == bl && skill->get_unit_id(skill_id,0))

===
на:
===

	//Skill is actually ground placed.
	if (src->type == BL_NPC || src == bl && skill->get_unit_id(skill_id,0))