Lancer; Blood for Blood (increased damage on next weaponskill), Invigorate (gives you a 'tp regen' effect), Keen Flurry (lowers recast of next weaponskill)

Archer; Decoy (consumes mp to dodge next range or magic attack), Hawk's Eye (increases acc of next weaponskill), Quelling Strike (Lowers emnity gain on next skill and grants additional TP), Chameleon (sheds some emnity)

Personally I use Blood for Blood, Invigorate, Keen Flurry, Quelling Strike, and Chameleon; since these are the skills I feel benefit our role as DD the most.