None that i can think of or remember at the moment... i know in the asian version you also need glazes to us DS but that was edited in our version.

you can use items to prevent a skill from doing damage or effects on you like coffee, coffee pack, energy drink, ice pack for mess and etc...

FB the enemy has to be human and HAS to have half or less hp before you can use the skill on them... hmm what else....

you need a bow to use arrow rain/volley