How do you like to build fa, still like the classic frostburn --> geos, fws. You like building fa? How about you skill build. Or course everything is situational but this isn't a build tip, suggestion thread. How do YOU like to build YOUR fa?
Boots for depends on how much chasing power my team has.
Geos no matter what.
Shieldbreaker or Wingbow
Then shrunken or riftshards. *usually skip shrunken unless they have tons of CC like WS, Pyro, Behe etc*
I sometimes get nullstone depending if there is a rampage or succubus, panda etc.
*Genjuiroo if the early game goes very well, like 4-0 and 400+ gpm* I usually will push towers solo with skeletons then shroud away.
I like nullstone on fa and usually get it after steamboots and a couple of those early game items (rott/vestments/soulscream/iron shield/locket etc....)
Then I get firebrand and maybe upgrade it to geos asap or buy sb. Then after steams, null, sb and geo I would consider items like mkb, bkb, wingbow.
Skillbuild: max Q with skellys and ults when ever possible + split shot when you have an useful item like an attack modifier/mkb etc...
If I see kraken/tempest/pharaoh/keeper or any aoe disable in my team, I will build spell shard on her.
After boots I go for nullfireblade, it is quite cheap while still providing good stats (agility!) and a unique attack effect (mana burn) that combos well with split fire and makes you better in teamfights.
But the main reason is the slow: in a 1 on 1 situation you can slow the enemy first, then hit volley with a 100% accuracy since he can't dodge.
I usually go firebrand after this, then upgrade my nullfire to rank 2 (do this when you start running out of charges) and finish geo bane.