A few things going from top (Least important to bottom most important)
I dont know if barrier works or not but please fix it if it doesnt.
The double combo thingy. (If u use smash/fenir on a monster you notice that it adds to that combo so you can use it again or use drain.)
Tempest is another big skill that arans depend on so please fix that.
And lastly drain.... drain drain drain -_-
I think ive died 18 times at zak with MY SUMMON because of drain and at least 20 other times with someone else's summon.
It adds more hp to you AND COUNTS IT at bosses but heres the thing, If it does 1/1 it takes the extra dmg on you but you only have the max hp to defend you so u die -_-