Moghancement: Experience bonus reduces the XP penalty for dying by 10%. It works whether you home point or are raised. It does not go any higher if you have multiple items which give you the bonus in your Mog House. It also does not work if other furniture in your Mog House produce a stronger aura than your Moghancement: Experience furniture. This latter attribute is why some people use multiple items with the Moghancement: Experience attribute on them.