the attack power only improves the phsyical attacks with the weapon that matches the mastery tree.
All three weapon trees have no options to improve nuke damage.
(They offer hp increase, ability to knockdown/stun, increased blockrate - all maybe usefull to nukers but no damage increase.)
chester23 wrote:If it does, does it effect phisical attack, magic attack, or both.
As already stated: it affects physical attack only. It's actually directly visible if you look at your character's stats while you increase your weapon skill. If your weapon is equipped, you will actually see the physical damage of your character increase.
[88] Vivace Pure INT Bard/Cleric, Bard 88, Cleric 88
[83] Pinokkio Pure INT Force Nuker, Force 83, Cold 83, Lightning 83, Fire 60
[81] Sybian Pure INT KD Nuker, Bicheon 81, Cold 81, Lightning 81, Fire 60