Buffs

[Anime]

I didn't know people relied on donor buffs, I'm pretty sure Trainer occupation gives @buff as well, but...

Buffs you should get are:
Holy Sword -  Paladin
Concentrate, Sharp Eyes -  Bowmaster 
Combo Attack - Hero

Instead of hotkeying them all you can take advantage of the macro skills in the skill tab if you don't already
These are the only ones that come to mind when it comes to damage