In canon the imuchakk leader, ramamoto has a unicorn horn used as his main weapon.
It is stated that his metal vessel is the unicorn horn:
http://magi.wikia.com/wiki/Metal_Vessel
thus as it is canon there may be some reason behind it.
I suggest they be included
It is stated that his metal vessel is the unicorn horn:
http://magi.wikia.com/wiki/Metal_Vessel
thus as it is canon there may be some reason behind it.
I suggest they be included