Thats only for Magic Class, melee class sucks in this game.
Only magic class gets powerful Beast attack, I think lv 8 or lv 12.
You can spam that skill none stop, hits for 100-150 Magic damage per hit at lv 12 lol.. super overpower over any melee class.
Also healer is best class to have, I been looking at the Japanese version of the game, and everyone in that game is a Healer.
Basically what you get is a healer is the shield skills, the one that heals you none stop for 60sec, also the one that blocks all physical attacks for 45sec, and the spell that prevents a mob taking any action against you for 30sec.
Later on in lv 60 or so you get all status buff.
Also Healer is the only class that can AoE mobs without dieing solo
but thats in lv 60 something, when you get 2nd pet aoe attack.