My item build for Enchantress would be:
Bracer
Bracer
Threads
MoM
Scythe
Linken Sphere
The 2 bracers add 288 HP and 6 damage. Insignificant during late
game, but very helpful in early game. 288 HP makes a difference
when you're facing a level 6 Witch whereby an Impale and Finger of
Death can take you out almost immediately.
If there are no nukers, skip the bracer and go for MoM straight. I
use MoM 'cos I pump the first two skills. Auto-cast Impetus, cast
2nd skill (slow) on target, activate MoM and he's dead, unless he
stuns or hexes you. Scythe is very useful in mid-game to late game.
Adds INT and quite a lot of damage as Enchantress is an INT
hero.
Linken Sphere nullifies the first spell cast on you, which can
determine life or death during a gangbang on you since:
They're slowed by 90% when they attack you
You can hex one of them with the Scythe
You can cast slow on another
If the game is not over by then, get a MKB or Burize for more
damage =)