Umm.... You'll want to be a s/s nuker if you're going pure int on sword. Max out all of the following trees that I list here for you.
Light Tree
Thunder Force Series
Piercing Force Series
Wind Walk Series
Lion Shout Series
Concentration Series
Thunderbolt Force Series
Heaven's Force Series
Cold Tree
Frost Guard Series
Snow Storm Series
Snow Shield Series
Cold Armor Series
Bicheon Tree
Smashing Series
Chain Sword Attack Series
Shield Technique Series (Optional)
Blade Force Series (Optional, has a similar effect to lightning shout series)
Hidden Blade Series (The MOST important series there is for PvP on a nuker)
Killing Heaven Blade Series (Works in conjuction with Hidden blade)
Shield Protection Series
Any other skills can be added at your expense of skill points, but for the most part, these are the most important.